Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffff4998b7bf4c2a…

MALICIOUS

PDF

74.6 KB Created: 2021-08-16 05:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 006191c89567435e8cdec13e55054a47 SHA-1: af362b195f06110625aa92c33afefe570d9519f5 SHA-256: ffff4998b7bf4c2ab3a69cfda812921d0c0b237a8bec3fc79b8134ef28919c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://roycraft.ca/userfiles/file/jabamogolimerezuwova.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/76179975774.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6378d3f51df02d6d949b5ccc04bb568d/41487872241.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/vuvipebu.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/zedutejewinoxazefewijojav.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3918a7e9b4a48ecdc4dbb22878c86889/dejoxuxukederebire.pdfIn PDF document text
    • https://schmitz.cz/res/file/xenevunazewavuwegowami.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6038d59f---futobabelozopaze.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/gimoxaburijikuduxagezokar.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/60855589561.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1d454896dffdd8eca9db73399fa577c3/70303323145.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/solatikumo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/9016947873.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/49714044213.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/wubejafirifasuga.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/soxenufekulukunivijepop.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d4e89eb75---gubedinijigixu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c79561f98---xomebidom.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/109cf64ff3779c19b8208ea225855b01/kolusuzutexupuxiratuwezip.pdfIn PDF document text
    • http://sns.hu/_user/file/teloxonataguran.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/18661104658.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/jiwarubinid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6a7d2e89bdcb6c24c7356112a56441f0/wuvemubinebubawajeferak.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/8a70ba4550f5f1219a0e99922bacd4f7/74789519690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+4+beta+5+ps2PDF 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_off0000bdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFB 17256 bytes
SHA-256: 540e3d96152e6c72c0261922a8f1bb36ae3898c95eb1b6975f580737a1b9aca1
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 11520 bytes
SHA-256: 04f7a3317bdaa2b566da91fe0faa924cd729bc403196827007f570e9784d36fb