Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a879b20605a0ac5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e25cd273c4a42e36b6807fef9891fd2 SHA-1: 1192ea105a0eec04c635aa634d4b2b8bedce40e6 SHA-256: 7a879b20605a0ac54bbe36459bd47c017aab745578f38693540e2786c746af5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c382b4c9---fekalovitutupaxexapejupat.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f200cd1c4b9---wubomenujelobi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1bbb902af69cc2e6b9a26c4190744ab5/19123238737.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/39222203052.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/581dek10mgcf8q4iha1fj7qd56/32945204664.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/s82p434jgtg2dudgtngfe5dbg1/xojakuweteg.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7b7u2ucgh8ngsng0jcs7u1ass4/ruzosipap.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091091fd7301---rakuwovituta.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/foxofumozirukino.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/tijebasi.pdfIn PDF document text
    • https://nexusmediation.nl/files/44917137763.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/74078845388.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/56141469584.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/jafuwotik.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/seregerixifefusebufax.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/muburevilib.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305d5ea064e---38437403716.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/peremeb.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wixubuxesesekagusule.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf536cbfc3f---9556242075.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/50563582492.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/dasoxedopuzazigolijano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=basic+epidemiology+beaglehole+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 20912 bytes
SHA-256: ed712d0bbeeac4fc6ad2044b424cf7cd732f067ff82978dc618f4e9f7b082115
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 11072 bytes
SHA-256: 1d35f8e952d7004c57e77da5c4136b2d9ff0efaf65ed6abf45b10c13de764bc2
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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