Malicious PDF — malware analysis report

Static analysis result for SHA-256 8762375d62403cd2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 14:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50be75d3f05a7f34dc61d930fb5fe0dc SHA-1: 92045555447727c68adeaf186f690e57fc8ab098 SHA-256: 8762375d62403cd22d93193c4ded8811d4938bea47d0912d6b45e2f4660a497a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://standdominica.org/files/files/julukalozat.pdf In PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/fizamamezososok.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/44291415174.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xowupa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614109226538f---46064503051.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/59655898973.pdfIn PDF document text
    • http://ilkemymm.com/image/files/gapifemuvidafovebagi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ziwaxalovej.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/iqn29go9l5gaabcb7juc6bet25/49760002353.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/podulunixaxelavijedabuwaw.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/suwivigovibu.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/lidutu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/95410012792.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/mavujenabas.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fovibipig.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/43535755582.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363db6785b9---mupaneril.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0b58e4a03---nawiwofupusoxiw.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/82799308293.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/notuvozifana.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/waderezobiwutelenopa.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/daxulozedesevilod.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/70731576516.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/62510383466.pdfIn PDF document text
    • https://digireg.dk/upload/8105238637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+elder+scrolls+blade+apkPDF 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 10512 bytes
SHA-256: 39dccee945d14959116ca1a2cc2c024178ac2d0b2ad58ec32d63a8f091583983
font_02_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 16484 bytes
SHA-256: 6318ed65047bb29979d7517a14b384d1ccf1c7f626ed52e403844fd810a358b3