Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e645573b582b94a…

MALICIOUS

PDF

119.2 KB Created: 2021-08-06 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0da5caf16d3647056283d9348a76d3a1 SHA-1: 2b19fad8edbf969eb2c1a242cbd6c9621f9bda52 SHA-256: 0e645573b582b94a5a5e52795945436c8c6e610e5d72567881ff4e3cea17b8dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice' and 'rapport de stage' in URLs, combined with heuristics indicating a fake invoice/payment lure and callback phishing, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • 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.
  • 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.
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8envnnnrcfpt09hvj013vfn7ev/tuxojulosaboxoked.pdf In PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/3031384577.pdfIn PDF document text
    • http://ceroki.com/image/files/60163337114.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sixet.pdfIn PDF document text
    • https://energooptima.hu/upload/File/84657607541.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ab3ef9a9a620811401bff3317db1b786/72575584398.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/47155583446.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/33553762392.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4b5d151eccd7eeb116f09d8053069646/nigidujunojasusabuwoxigow.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0aa02180a98bda783721d97995e87941/37673885197.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df0ac4635---gamerufixurelamubezizojo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/achtn235prj72tjvggun4sgces/81662850833.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/makinuvafuje.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sorow.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b005ece94---11937863706.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b2b9a24e---24144974355.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ad830d5f---bisanuzabe.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160831140ed003---lajuzupidutuwuwiv.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1695844e9a46d6fcf0f656c5676617e2/zadetofulevaj.pdfIn PDF document text
    • https://rajaunited.com/contents//files/80915346481.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/waxikotuzixitokejidu.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/69463409003.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748791258a2---85987282324.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopovujusuluv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/7006308595.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a25715a204a929ef05b831ea3bf7dea/bokajozoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rapport+de+stage+pdf+comptabilit%C3%A9+tunisiePDF 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_off00016b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001836c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836C 11400 bytes
SHA-256: 31dcf0c1a21b2d2f4ddb52131da7b10e66bf8a0be5ae1e0fb00a7385db578497
font_02_sfnt_off00019d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D99 18532 bytes
SHA-256: 7582f5c52f9a154bc7f1e7ed3c5e172aa6b465a89a1786340567d4e6d6e1002a

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