Malicious PDF — malware analysis report

Static analysis result for SHA-256 3450f87ad10608a0…

MALICIOUS

PDF

91.9 KB Created: 2021-09-07 13:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70faff13d2004a0366a159a16b2edd39 SHA-1: 511c0b52814b88795f0493f56ba82eeb9f85befb SHA-256: 3450f87ad10608a0459a3f1c19987512861d2d17e2ac7a4e984ca80767127ddc
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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=modelo+solicitud+de+empleo+pdf PDF link annotation
    • http://kondicionery-vidnoe.ru/upload_picture/file/verezu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b37d968cf---nepuvajoz.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/bagonoli.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/denogopom.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4434e056db---13836894424.pdfIn PDF document text
    • http://grimastone.ru/files/10665254985.pdfIn PDF document text
    • https://efnnma.org/files/file/95037127178.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036857e81a6---7976819684.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/19472769828.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4744967a7---tuwero.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7109d166b1027738f4b1c8a409c4af4a/64112620253.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60331112630.pdfIn PDF document text
    • https://faprosid.com/file/jesilopesirawedu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nugivefimiwofijulawivipuf.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/komipanotogapejefef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc76e64b3---mazelelurapanomunurakuwo.pdfIn PDF document text
    • http://debden.org/userfiles/file/9004782970.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/19q5km0a2flcn9ou2msoi4lko0/15957153163.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kafugetasosevijide.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/72261698660.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/30340310530.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7mbs2802rj5a0pjtm9sq0av9hk/gonezokurepetowamelim.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/bababidovajemobofuj.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160768ff52404b---55814651347.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_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 19284 bytes
SHA-256: d1810fee8b37980307e3c8973e93df111eabf21db492075636a2642730bd5031
font_01_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 10508 bytes
SHA-256: 8901fb01d49ebc831e3ae2b77cbd28572ee6e4a630f346518f9a015ed7b2b007
font_02_sfnt_off00014961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1