Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b2584f0850809c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-03 05:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6fa9a8e6bc0e31584bed6f9f02078e4 SHA-1: f34ce4687add325b05b2f2218c46c1ac63c72a4c SHA-256: 74b2584f0850809c313b7f683cc8b235d55e0f1cd9eda610d4031510a8e10c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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 http://abwmarlboropike.com/uploads/files/puralemaselonotonaje.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b80pupjdqk3dmitk0qv59tukok/85255419381.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/52112663202.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/66507354115.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vkhr2o4kh7v7t4e1moe4d677rg/51381673458.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb9f8962f---wudovodezorowo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/nutenesikusup.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da8937254bbd5677d6911f1392fb771d/weduresowibexekavafumisag.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/864b10cf31991a177044caca774dbe54/sezoki.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dijoforuwonupadew.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/zurivulivesitejifokeza.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/57301113127.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wewogugas.pdfIn PDF document text
    • http://huntland.hu/upload/file/36755999977.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/9subp052pcm4om3nf456gvbs24/60607451326.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a964fc6807b---29078668297.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/lesosam.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pgbi308n9bl270ee5rvi83k3dg/35672533236.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279755ea0c---84758967407.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/bupukazuzididuz.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d334c4bc2d---20194726312.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jelopiv.pdfIn PDF document text
    • https://nada70.org/userfiles/file/99510504116.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wezerofulebudawilol.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607788cfdc2a4---14433743670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=50+shades+freed+castPDF 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
stream_002_off000115ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115FF 18444 bytes
SHA-256: 06d5aa26b8f0ad807127894269caab61d62d806d581dfe8627617f443bfd0cf2
font_01_sfnt_off00014607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1E 10368 bytes
SHA-256: 3e874d67052eb02304a818c8203caab554f6edadbb0445323a24e864600ec968

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