Malicious PDF — malware analysis report

Static analysis result for SHA-256 a852d8cfdae5ea9f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-16 04:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dcd5caa01687846fdb751842d12de52 SHA-1: 70d16d626bae0e8fde58218064b8a9344a837dbd SHA-256: a852d8cfdae5ea9f5ea84da8766138371a2b8186851f0a885a088de38a4dfb4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=genetics+from+genes+to+genomes+6th+edition+pdf+free+download
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb083b8dd11---85189258631.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9130b051---wokuzolaraxavo.pdf
    • http://uniroll.pl/user_images/file/gedipir.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd3321b7c---43847413483.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/feea536bc728ae7a50c6a9838fa57799/tapolazapenaluvipoxa.pdf
    • http://ahkjt.com/upfile/file/zepemazelubifarekodetu.pdf
    • https://psychologgia.pl/Upload/file/nelujozajovamawerani.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dofinid.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/luaga2s7q8e29vktcrbjqoetdu/gazakuxaxamawa.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c30c246e---26481134344.pdf
    • http://www.dean-cpa.com/files/adminpic/file/12296508498.pdf
    • https://cmsschoolkg.org/userfiles/file/korovikowiteje.pdf
    • http://tomaszskiba.com/userfiles/file/8208809163.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/70132072393.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0720ab82fc---gowuv.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/xavesazub.pdf
    • http://volamtuyetthe.com/userfiles/file/zizug.pdf
    • https://lexconsulting.ro/webroot/files/media/bufemefaduvupimekufu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955654cf1d3---lobupusavuvuf.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609db67300de4---80278765393.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/195be1128236951717144c6e36394076/jepujalirapubopere.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9fc73c9c---wivaxowojumemiguxixu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608592e45027a---25970613968.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/59dd73b7522bf8c77b68da7d17d65cfa/jinema.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879da3b2506---tawikejez.pdf
    • http://astro2sphere.com/admin/images/file/5226986187.pdf
    • 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_off0000de0a.bin
94f4be4d0a1bdf453dc9d8ca1775d225b5fe01b299cfd4da99f780ce57dee717
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 17504 bytes
font_01_sfnt_off00010bd2.bin
c5ccde1cb8189a3f187babc5098c1a3a0700d55466da06de331a76e6b51ee840
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 11360 bytes
font_02_sfnt_off00012649.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes