Malicious PDF — malware analysis report

Static analysis result for SHA-256 831df0d2b8a26ca9…

MALICIOUS

PDF

79.6 KB Created: 2021-08-03 10:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14da5ff53ee6a5eec520d6ea637419e9 SHA-1: f817898ec86eec5f37a603ba09cf51072d84cc79 SHA-256: 831df0d2b8a26ca9fdc8a547c9b28e9e4224f0513aa6462d7613d06a4b46fc3b
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection mechanism. The presence of urgency and callback lures further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=kenmore+elite+smartheat+quiet+pak+9+he5+manual PDF link annotation
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/10794017993.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/piduzumelu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cccaf1747b081ee67e9c7920e25f8349/pivununateguxukat.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/11822255752.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6ef2f31f---58733708187.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/fovofobagizogowu.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/77168849991.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/lukuburib.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fb2394c9---jeziguku.pdfIn PDF document text
    • https://goldenapp.net/file/842865585.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sijetemubopijisinasaf.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cc6659faf9eea11bbb3a35525b805a78/kesugerisusetaranelef.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/49969143074.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/18188494653.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/55456223157.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4aa155d5---65804405869.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/xunazepefigisobamogovufev.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/4412352479.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/zibujumifufomewev.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103149729d11---naridegerelixojasekigulo.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/pawazanage.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/71245702131.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/17554534780.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lanjsqoldk5ephobi6db81vhti/buvudo.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/32039422805.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/lebomupixejuk.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 17400 bytes
SHA-256: b00f3c8bc5051a7e4401b9c770795d48ce216731be23979d512314ea4aa46c45
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11148 bytes
SHA-256: 3dcf57a4ea7f3735db26959d2f484887dbd5e40930e47a98934a08eb65e62f0b

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