Malicious PDF — malware analysis report

Static analysis result for SHA-256 c689360dabaf08c8…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 07:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ec0a548c361888e957a407c50f42424 SHA-1: 72c3ee48ab443f3a27a039e25d1459b70da95506 SHA-256: c689360dabaf08c8fda139edc8262fe6baec4714f76e6a0199528cdc3c9d2767
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The presence of numerous links to compromised WordPress sites and disposable hosting further supports a malicious intent, likely to download a second-stage payload or facilitate further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=rule+one+investing+pdf PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d084cb21---29461641175.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d6e475837---62495512233.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/20623140979.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/viniwaniwopidutu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf62dd727---32273112912.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986a9e5bb---lofokitijazudito.pdfIn PDF document text
    • http://sinoorchids.com/image/file/xogunajato.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fd0ea90abc06c1074907e9956adc7b91/66687456241.pdfIn PDF document text
    • https://melz-feu.ru/upload/10028818745.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/fijegixojataritupanonofa.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f809f23f0108b13d82c7f52c77ce5e73/gubuzuma.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/22b7317341c1b73e54bccd1d89ca0fd8/wafeluxejuzavuj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/97bbc1e4334b4372f3dddb838966bfdd/lifowatubilizaxosa.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/guguranikototefivoveso.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b0bf65f236d4097fa0adc88ea44b22e/70543933856.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/bexesuvotogajurezugememo.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kajajeletar.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v28hjp79u5srva26b7l0f93u0v/97781224279.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/zasumiwaxibemu.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/1550364854.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/73052892505.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/negikodaduxirur.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/89871889635.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/4911296983.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f14c7e95ae2286d48cb41ccfcc0dbf13/7402635635.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_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 18340 bytes
SHA-256: 744e449fd45306eaddf9f004f3aca72df3a280077a5cf002f8da37a68a6cc44e
font_02_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 10624 bytes
SHA-256: 02fbd615cb66dc1b991523ebd388a49f4e0f2622e79926281cf84472391c640d

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