Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4e14cab037c913…

MALICIOUS

PDF

83.2 KB Created: 2021-06-26 11:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1c0b3ca0a37c92781f9831ff70eea7d4 SHA-1: 2268eca1932788c4499d87f9c356fc67114cec90 SHA-256: 3e4e14cab037c9130d6af4df59f42a545f0704782b1e1ab1c1e8795df32b0f95
176 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an exploitation attempt, possibly leveraging a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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) or Microsoft license-boilerplate 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://drafthe.ru/uplcv?utm_term=merge+multiple+pdf+files+into+one PDF link annotation
    • https://smartcirclegroup.com/userfiles/file/79478702797.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/864c433ce538cac97d5d6956ba0bc7c3/geteluluku.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/94838258909.pdfIn PDF document text
    • https://ancoraeducacion.com/images/42025130610.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/11944017850.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2m62bot2vlguljqeuv835okh17/dagiremefelitebolanax.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f95d6ff795078a2f1d69f2134fed7fe1/lufuneletu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081618bdea11---popisozanuxomonapalixevel.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/db6180216f74ae55827ac4aec9ac3190/35796362451.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85ae9443c---34439954379.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/760bfcab9653e090e77c5e0834a7e787/10268624265.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/61269891377.pdfIn PDF document text
    • http://normel.org/files/upload/file/50655558742.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/75b09ccc868c5f830be555539f554b77/jezuzipogasuzul.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa18e06e6---25265829654.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/zibegokazopenuf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ce1cc42---5190590598.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pd91neu1c2et3ku8vbvqqkk4q2/18100902636.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2krv9be5mcu5s0n5bpckvfells/nigefosufusomedavej.pdfIn PDF document text
    • https://khanikango.in/file/midetexatodobovifom.pdfIn PDF document text
    • https://bloomeng.com/uploads/junopusinakez.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ed4a012f---jabimowikosetude.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/35967295091.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uno3hkacel17ra8a2cb3tsjpfj/80757174417.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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10772 bytes
SHA-256: ca199a7a7f286579b03ba1bc9c247e4dd6d4fe7205abb32a8746909244bead7f
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16924 bytes
SHA-256: 8c7ca6f112b379492bf63cd3159a7bbb3a7ca0ad3b3d899174dcdd2ea6eebb08
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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