Malicious PDF — malware analysis report

Static analysis result for SHA-256 211a9237f144f799…

MALICIOUS

PDF

137.3 KB Created: 2021-07-19 23:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 34e753b071bf347fd68257e28b0378e5 SHA-1: 30ab83f34cb8357b74979332ac6d20b1153efce3 SHA-256: 211a9237f144f7992930d7f8c7a9e832c3a34ba236b476a391701eee8ce378d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a6e1e91b2---nafiropoz.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/v0pvckeu99js1e6796ein4p2aq/ruvubetivomalitikuxa.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/87984658d3ee3059a18b5d058ee67669/13556603593.pdfIn PDF document text
    • http://strap.sk/uploads/files/mafaribukok.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sutige.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6375630d36cbd55c93c373be7ad66207/2865574323.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081378644e1d---wiferemagatibulubatop.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4a3187fcd96ff941e2f5bf64e3fa4/52823090753.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e4062e0ce---58697066947.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76f8bde91---51832506228.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76f945e39---84153878078.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/97939696596.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jopuzujulavap.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7f0fbb2107e0a77de12c882d64aa8f7b/wawamojumenisatefagipe.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/ridogusirabozimusobi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28e49e383---dufanoxofipaneterezil.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/opptse31jm8dic4r5k0sro1b66/gexulomusexuk.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7p86sm5bj8i340hbl006irufd/38011277134.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e5b912fcbdfb96167f904d73164d6f1c/70232712892.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/muxidubigula.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/80362635250.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rewedofenipeduvanagirurap.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf514a9ca---25858395501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=code+word+for+m+crossword+cluePDF 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_off0001b35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB71 21500 bytes
SHA-256: 6599b1cc13986f2d1159d7d057b88fd76011a92c28866aea246de0fc8d79ea3e
font_02_sfnt_off0002007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2007F 10400 bytes
SHA-256: 1b5ab837f10b25e2a9f0b56ec101eafef7bd7a44fdebd975d980574fd504ace6

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