Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e35acbccafd65b5…

MALICIOUS

PDF

100.4 KB Created: 2021-07-13 23:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 96c7c06d7a24b55293bd9ef44eb46c4b SHA-1: e32858e5817390f4a633c18eb17c9fc0278c3619 SHA-256: 2e35acbccafd65b57a95c55c8469e4df6d95a294b227d4b917c7e6f8ca9e9220
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'Callback phishing phone lure' heuristic suggests an attempt to trick users into calling a fraudulent support number. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=horngren+cost+accounting+16th+edition+solutions+manual+pdf PDF link annotation
    • https://binarbaidfabrication.com/public_html/userfiles/file/mozadaj.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/73581346992.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/46642509703.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mojizeguxutudepaxi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff7adb25a---51056310175.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba013c0d705---ledugodenagagopitiduj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5noqm3hliuvgo91t9bf4i85vd6/5353361599.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94119758120.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ruvaxivorikomepudixorewox.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10751222368.pdfIn PDF document text
    • http://93564497.com/userfiles/22134096999.pdfIn PDF document text
    • https://birudongker.com/contents//files/28546414408.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/buranejejepina.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/kugituluxerasedilomi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5abb8bblhski5fpper4ttiu57p/dovirivinurunadid.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mrjd8gkg27u7r75uk17ik04hgh/30662024534.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vuvojugupirakelipatulude.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/vinezagi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e4d1287f---pibaresasaruno.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/95cecc5eb93a1602b3e2ea9c82d29612/92783182394.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc824cab0---51242276182.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b9ade72c2ecaed4dbc66fefe510ce631/51851893444.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/63697198501.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/98ee8e6f5a1426eaaa8be9a1af408321/70944545221.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gerigewutozifemisevovot.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1fe6a9aa8a6ee3a938049a3c56dc26bf/25133797834.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 11380 bytes
SHA-256: d3e75de4782dde1ad3e34ff99707fff3686f01d35ed6590ebd66f77fda79ded1
font_01_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 18672 bytes
SHA-256: 9b373ed45996bb1d18ae5eed51fef70790f28158aa9abc78800995a87ef7407c
font_02_sfnt_off00015d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D35 3520 bytes
SHA-256: 59753fb5b580a5676770e5348ecd3efc991d603aea9c3cc55fb655ec5c8219a9
font_03_sfnt_off00016a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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