Malicious PDF — malware analysis report

Static analysis result for SHA-256 4306d924731b27ce…

MALICIOUS

PDF

96.2 KB Created: 2021-08-19 10:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 48deb0372bf332778d7d6ea74bb508f2 SHA-1: 88d558c9d77a0b2ae6c25bb1a1648ad0eb724cae SHA-256: 4306d924731b27ce7d0f21be31e08a24eb2efae7ee32921813a219e65b6902cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm to distribute phishing content or malware. The PDF structure and embedded links are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=what+is+a+communicative+competence PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/971e67d1dab6fddcbd4cae496b5a42dd/nonibazogaw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7363eb31f8---40252272501.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60212697.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/67578632687.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/foredozemutokiginitetime.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fa3f306b---71724396816.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/91771282686.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ef4e4e6e---24532363344.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/oe64cp0vr29doeuaneu3atqf65/47507870083.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b404205c20d---96347052044.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070010b3c4f6---sobabowibodulabor.pdfIn PDF document text
    • http://fygl.net/uploads/file/222042331501.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/58425118533.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/mopufixetemixevuleri.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ad38b48b---56941266934.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/g4kp04kijoviltfcuvlvseg254/52060439525.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607751ae961ae---winim.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/laluganonez.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ffd62f74a---11036778452.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdbad1948---84595865650.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077afa9e8795---nobejubijomas.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wamiwuz.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/giwilefibepumezet.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedc84b644---gatigakovip.pdfIn PDF document text
    • 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_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16872 bytes
SHA-256: 96efe45e4550619d848b00f9b19346bdafebf094c281d1cf9a2c40d96792fd4b
font_01_sfnt_off00014224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3B 10652 bytes
SHA-256: 57139978db02ebfee24c553546085366ccaf5e59359023b389949b1f32b312d9

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