Malicious PDF — malware analysis report

Static analysis result for SHA-256 acadce71bec5dce9…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 02:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aebdcc983afddb4c701ee7a3622e2aec SHA-1: e874fd9179e85288fc6e9e748669f6abed2ccd49 SHA-256: acadce71bec5dce913a91ea97968f81bf12ff3fcafcfed6cc52c5545fe82a2ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to other PDF files hosted on compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The presence of these links suggests an attempt to lure users into downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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.
  • 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://irlanc.ru/uplcv?utm_term=reasoning+problem+solving+questions+and+answers PDF link annotation
    • http://lapawan15.com/shop/fck_file/file/wukaxesew.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/14987494321.pdfIn PDF document text
    • http://asfalon.com/__files/file/75757831370.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f701205a746d325f0bced4d9e9702668/22208400998.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/retupujivenegasepenume.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/75c59651ca74d9c8b5c0a45f4f036642/22523920644.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/bababojimixapo.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/54119861929.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af66ad7dc6b---mowufoxedukasorimagufoli.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d5220ae2---56385050466.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jadizobedewibuli.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fe7871483d9a28e0eb93368c7c68a9fa/26436932682.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abed46519cd---50991422537.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607badf077896---15785785625.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/66d2e780fdcc095c3dbb62a5d54ed9fc/34536717526.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2971437e---581198063.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/29fe7e1feefebe5e2d111986cb32a2ee/rumesofefuxafijajudarifag.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/342405c813e4c03853f38a428888ae0e/powexopalatonazegizabez.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7095b065---dodojobosevopad.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93b75de29---89693468025.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/14668094996.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/suvijur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 17200 bytes
SHA-256: 673c7b23a3fd79afc704f603796cd7a7378c80ad89b0cb2423abc3d33e790b1b
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 11316 bytes
SHA-256: f7c4491367e8d9b5015a389b3c348fa5402dc87700888789033e45b40df75d0f
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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