Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01231770af373c8…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 17:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18317a22ac9e4f3b3a44cb1d7462fbfd SHA-1: ad95a4d16bf5c193464ee3073555b27554cce160 SHA-256: a01231770af373c876115192886cf6b0eaa5a36d12f5e8ac66f2ec74ede37e2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The primary function appears to be redirecting users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pan2r1d84d3th4jgrdbeh6gtq4/rerafixunefe.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd99555a94---60527844148.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784d1d2b549---94156014636.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7dl5sn4pldpfnc0jg324gc0p54/wifatopek.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e20886e57---kowulowomes.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d0f7412a---46284021362.pdf
    • https://a2designbg.com/userfiles/file/vemonulaboge.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3f17968e648dc9861664f8a515fd55be/bikefeli.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7256d14efb---gubul.pdf
    • https://agermag.ro/mm/file/69651660240.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0026efa76dcaa5b0401619132f350254/8338241661.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/xawugofukofazo.pdf
    • http://nowyhotelik.pl/userfiles/file/31550213673.pdf
    • https://hasekei.jp/userfiles/file/kokowal.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c4102f87c0ab71752c63b589cbfe8b6/31014323158.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/phraok09dhisb4dqdsm83e49a7/52681691894.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0225015d6---56298969714.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/at3uorcg02f6844ja31sfcuhlh/73973553477.pdf
    • http://energy-labels.com/userfiles/file/lokoluredimofivebozis.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608604e45b155---maluval.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c0020ba4ba6fd837dc719acd7ffeae7a/19248966244.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/037cd89b9b3824993bd19a686d21831c/44716137130.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f57ed333da6c71c4311f5818bdd5b9e6/94619114667.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1867c187d---lijikaloravisatofo.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0ce580c2---79936374172.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6f6ef828---vadumitoxuze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kures+guest+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
font_01_sfnt_off000111da.bin
bef64a0e3aa6c0ccc7c1d4f0ea224045cb136a6b69a4395f34b1cefbe61f2b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 10072 bytes
font_02_sfnt_off00012877.bin
3d353ca6c6dbbee1d3b9fd74be57f49931a1f51da66eaed04f9c147875dc9594
pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 17368 bytes