Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b07ed392fe4bcc6…

MALICIOUS

PDF

102.0 KB Created: 2021-07-03 13:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7213338650286df0209ff59b6b84d925 SHA-1: 36f75fb96ed65fe2148cc7c1da2e85078ad337de SHA-256: 4b07ed392fe4bcc623d0939aafc1138bc59115d8d239b15912688a79fadfd1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of external URIs and link farms on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=bloxburg+outfit+ids PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k87tskpu3r9khvehl54m73m0u4/dojiburusofe.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86402644323.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/96054207310.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61642a954---95866880760.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/93e15a155d9d554454823adf7d715dd1/28443684844.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/lujunakatusebanipodevabi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e1875901---61777901202.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/n1usck14f722siktspqlb05980/lakigilipojuge.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7h5tomjvo5mjn8gds47vgje4u1/xulokolifubixapelojeg.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/suzuzaliwu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26f0dc26f---kutizanul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8855psin7obdubsa0cp63cbpb7/18274841133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d24604---78039811437.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/dogomef.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/78136018481.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085024b66fec---73199160902.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/81739749154.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c983144a528---40272325663.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff20ccb2d31495f7d6568fa800ce5413/39069156209.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c3ab814f---17296333261.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e805e64e8---72155865856.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/451366beb461133500fe0b220f9cc2ad/sodarotenitudaf.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12477e76---gesijufanefinamep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 17912 bytes
SHA-256: 101221b0d94aa9ffd2f534abff9098e663769c54e29071747ab5cb8314a01df5
font_01_sfnt_off00014336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14336 10524 bytes
SHA-256: 4cf8279750accafc74d2fb2eb0b960a3cf12b23b7bc958da8ef8cc75340e56fe
font_02_sfnt_off00015b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B15 16556 bytes
SHA-256: d26a58f9d9364986a4087fc1cf333b3d7e8005737716f498990a3a70b369ecfa
font_03_sfnt_off0001723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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