Malicious PDF — malware analysis report

Static analysis result for SHA-256 9438c04cd114e8c2…

MALICIOUS

PDF

92.2 KB Created: 2021-06-29 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6145605fe7d7160941d1a4d0c77a30f8 SHA-1: 54cb3c454fdf71fa395aeea486c540971a358cae SHA-256: 9438c04cd114e8c2cbbc611b7d48f3b14fae744c9e5687b1b39b4e69ec83df7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to invoices or payments, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6d56ea36bbb996395ec9883c216f80bc/lulakas.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7u46u8lq649v4v5fapk7evh2hu/xedazaxe.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vapugebenopuvapinomonan.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8cd03b2e0a18c2d964e2af04f5f08647/13084192716.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gexamazokalulugeloxazak.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/28770893280.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160804306d8b00---12329504505.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/63989879260.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde46a8dba---44784928901.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085eae6789e9---dexekepilapabigo.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/pijejitozoxobox.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/koxomegusuzidanasugu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/72207884758.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wuwimijibakusujever.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pozabixojazavamoraxukufaw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2840bb66ca---degemixonamuwitiri.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/golawuked.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160843f1bb42d6---14026104774.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/dusajamezumoxanonop.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qh65e368lq37gv5e0270ngng69/50117499139.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6f5da7dac7dbcca69581e10216c1b6d3/54506909305.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe8615ae9---bitoxofepuvobamivezune.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b73315ac0cf839c12996d6cafd47440/59756638584.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05af183c5e---tinijobonovuxewoxizak.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/kalizefofoxovagefefaf.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55586df21---dubimovilowufefituduga.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+look+forward+to+catching+upPDF 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_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10828 bytes
SHA-256: 2993ef6a68498090b78fcf4872eeffcc1fce76ca428d9c4905696ac0ff90792b
font_01_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 17448 bytes
SHA-256: 083c0c41cf5c7154b47942d70f186d9d25c693363a7ccf43bdeac15832196b0e

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