Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9b9fcc77499836…

MALICIOUS

PDF

77.9 KB Created: 2021-06-30 23:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c65d5ee1cb23ac45c2da957bcb9411d8 SHA-1: 5599b24c176dfb66a789af4be0d959b592f855fb SHA-256: 5b9b9fcc7749983652d7458c580c6a95085f875245dbc659e284a83367b6c647
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and the ML classifier output further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8ofh43ebdr25798qucotrs1nc7/39965887674.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0fe1ea4bf---fabebukajoralabameg.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/wukijikas.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5c6361ffc98adaeb9b487f094bd1e03f/9196645578.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/zefubepex.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/12418113709.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfec0fe50---temivofupinokile.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/00h4ve425reqr39vpur759neh0/gapojip.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/84749736459.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421d3e23cb---45773095671.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803fc3b1e6e---87792927204.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/46145795575.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/lilax.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1954f0a220a128cb70a330dbac5d5f8c/zobalupet.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wumogufupoxunexidodizibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6a0ceec4---lamutufude.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b43f14a6---7718145332.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5c67942f7d4c4bed788f7b2e038282ad/sujowagapulef.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/ridasagiwoki.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5237e63ee---29097830906.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5ec602d6323dd469049909797505b8f3/81838198143.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/kijolebumeli.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/03f3f3bf5c96fc68cd45f582ac2e38ae/76032768540.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ff7880dc5e18c3c80fbe398185049df4/43377171694.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/14587717847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=word+derivation+exercisesPDF link annotation
    • 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_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 10476 bytes
SHA-256: bf487b90b24a1e6093124ef7b83707da656bb0fd953fa70e01f37d2f196df91d
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 17228 bytes
SHA-256: c0892bf0e295228514270d360a13e0fecebe1d05d6936ef88d66b2aaed66e791