Malicious PDF — malware analysis report

Static analysis result for SHA-256 b479e69ed611fe79…

MALICIOUS

PDF

86.1 KB Created: 2021-07-31 08:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 46901b105a8fe40030cafe611f372be0 SHA-1: a5be4f099f93c47f0bff89c43566628efd55b4a9 SHA-256: b479e69ed611fe79447e8f4727d6d95697e59c8037fbcceca6d630dc51ad26fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', and ML classification strongly suggests malicious intent. The primary goal appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e0802009d7a3d5b0cf8b5996a99d9c63/wufetetusikidoz.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaeea501a---forurizidowanabamiranitej.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/616bef9c7d86842200108fae6e933769/xatewokesomuforide.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/movukufiluwelemike.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/puderebolepamogasa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/gamafelonokajor.pdfIn PDF document text
    • https://advik.net/userfiles/file/58361586592.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d821461f6da---tozetedegaliz.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/jizekikurubu.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/wudin.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b51dae20---38963972588.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/pamuwokirez.pdfIn PDF document text
    • https://promise-land.com/upload/file/53733674723.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gatagimo.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6huqusojqurrov49ku6fhrt7v/xenip.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/14732984699.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54ff01cd0---bamixorolawom.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/kumewiv.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/85428297137.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/4880384611.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/pikikeginoluwijezego.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82111254639.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/rapirutiwenub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=walter+e+williams+books+pdfPDF 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 17140 bytes
SHA-256: a2ac508076f7397d7fe62dfa96ade10565ccb14eb2431d4c7a241e30f82a5b3e
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 10868 bytes
SHA-256: 3b128616f5b6dc1d9ec80262ecdbbf3dddf9c996183e0b7e1e5f183c593d117a

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