Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8c44b36025cba0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cafbc2dabd3610986206c607a323167d SHA-1: 24a90391b584b852b9841cf5626f6fb6180762ac SHA-256: fe8c44b36025cba054966569418d3e8dfc54e9609b627ed870c5c1dfbc3bdb26
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or potentially compromised WordPress sites, indicating a link farm designed to redirect users. The presence of a 'Callback phishing phone lure' heuristic suggests a pretext for users to call a number, which is often associated with tech-support scams or financial fraud. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=albviral+frp+android+7 PDF link annotation
    • https://speculatio.in/ci/userfiles/files/xijomugi.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/warinetedafedog.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gaforeg.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/40049990111.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613846455448f---sefuw.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/vutujalugum.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/51884494214.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/wokezakuwesagul.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/renitobowinububizolurite.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/63947620035.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/40854201404.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wixewuwomotu.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pokuvip.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/dutojafadenakakezer.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/14980859010.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/rixopivawazewijo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfccea828---35857100133.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/93179659831.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/gajuzafojobuxoxojujodiki.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zates.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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16964 bytes
SHA-256: c07a3bdbb91655e619815a22ee04d80aca3a33e5beb2aad46d082a8eb4780fc5
font_02_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10328 bytes
SHA-256: 18e2a627613acfd37c40b18935f2db8d8e6419dc168d9ab133fd985f9927fdcc

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