Malicious PDF — malware analysis report

Static analysis result for SHA-256 6712f6545e92d069…

MALICIOUS

PDF

104.5 KB Created: 2021-08-24 06:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c126312a8dd9d4c7ff0f7d6dfdefa0da SHA-1: 142e92ff4a09582fc2eb67394f332bdae03a6988 SHA-256: 6712f6545e92d0691cf7e8d203e432ef200aa82965473f41721ab866c82584f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to prompt the user to make a phone call, a common tactic in such scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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) 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://oniceh.ru/uplcv?utm_term=to+be+rejected PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/kosubamo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/26747443132.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///38464708654.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/14265744767.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/dvgpnc1k8u8k91c77mkukis67s/55501978644.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/fupoxata.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/62213671419.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/dorabuwegativanete.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/029715514c84f1bd2a2d115468eaaaba/fizunanogifisowakotapo.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/xadigozodagadimo.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e1b74e9399cb05485f1e6c45f1645da/99353347230.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/82ce43f9de9c5ff3535b7708638975f5/34871055006.pdfIn PDF document text
    • http://vejwun.cz/images/bojote.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/76276581476.pdfIn PDF document text
    • http://furniture83.com/upload/files/fepazovumomobajuj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160742ed402265---27027785423.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2ecc5c20---pefuwasupepabagor.pdfIn PDF document text
    • https://pellevah.com/upload/files/vagulake.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/satebijera.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/20753365308.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9beb22dfc78367f2d1de05dece41efce/67770563641.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0da4cf1cc---vetawajapu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/61196270640.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071658551ced---potinigofamajawude.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_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 10024 bytes
SHA-256: c25955a22f2de4021450e902117641a230eda84f29e82e4f2120d7df7bebaa87
font_01_sfnt_off00014e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AB 17632 bytes
SHA-256: 48e7ef4b4d2eda15786bc6769b8210a026a5a5c5dbd6123ba11bb89f72e2e640

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