Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fd8fea7e96e1a6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 22:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3bba142ceac33c9a99e7181a2741b54 SHA-1: 396c6124cc132b9f05e58890e91f384bdb8f7ef5 SHA-256: 86fd8fea7e96e1a69ab83d8ba080e585a32229e7c098c9cf534f0174130e8c63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of ClamAV detection and ML classification as malicious further supports this assessment. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=kabir+singh+full+movie+download+hd+720p+filmywap+com+online PDF link annotation
    • http://yyfxsw.com/upload/files/55833671245.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/nijuwafasubepazogavolo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/geweposelo.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/89744877401.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zaxadarenimoribok.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/zafemo.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f777332db2c94ce8618d6c0d3089d552.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/32151808042.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33a00dd56---pefopoza.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bulalovinav.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/xisumu.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/tifanavefefunuselub.pdfIn PDF document text
    • https://wonkingchina.com/d/files/57302537704.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/mubapam.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/jakibimogebenemufarokos.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/jekoke.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rapemuzibajiwazesepemovi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f443ebb9---88639274912.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf189904---64005795343.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/37326502819.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/fojobimafinitagupejosipi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161323b5d0bf03---71408740190.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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 11760 bytes
SHA-256: 10148c456452174d1f3acd90b6ee501327caeb048b4ef9ffd8204d3ce65d34e9
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 14936 bytes
SHA-256: c20ee68679750b73b256a00e4e6ccd05767e9621c8e1070c09dc5842083a6eeb
font_02_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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