Malicious PDF — malware analysis report

Static analysis result for SHA-256 296543a53a405f45…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 21:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e3cbb855c672d64c1cfd27ef97430c0 SHA-1: fb66b699c627a6722beb579c23407ef82c4ef033 SHA-256: 296543a53a405f458f5e4c37359442bf5a7352224c9b2aa0d7bf23c1176b1ac6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and algorithmically generated URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=sending+iphone+photos+to+android
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161467d8743411---xilevilirajomisafabidatu.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/25008716424.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614607b99373b---gelufegonamidujisaso.pdf
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.pdf
    • http://fratellilongoni.com/userfiles/files/lefovoruboxod.pdf
    • https://123natura.com/stockages/files/tevagilazilazobenasagoj.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/31418882212.pdf
    • https://mdteam.se/ckfinder/userfiles/files/77167552372.pdf
    • http://nhac.ditimchanly.org/Images_upload/files/24627194541.pdf
    • http://cnmrobotics.com/files/files/4850816797.pdf
    • http://sz-nuoyi.com/Upload/file/2021092219540155723.pdf
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdf
    • https://ww150007.linebot.net/upfile/files/20210923091524.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd48dcec5d---3298194821.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/devogudaxuxuwovabut.pdf
    • http://eternaseguros.net/files/files/poleduvilanemirisumak.pdf
    • https://santa.sg/images/users/00000000/files/dojemejav.pdf
    • http://stavebnevyrobky.sk/www/upload/files/22706861774.pdf
    • http://hublihorse.com/uploads/userfiles/files/59137762280.pdf
    • http://offerparts.com/upload/files/suzedagozura.pdf
    • https://aldapa.eus/files/galeria/files/14463817516.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58855656806.pdf
    • http://www.moyekolodin.com/files/79939512689.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA2 16792 bytes
font_01_sfnt_off0000c6b4.bin
b37bec687c0ae33798e1bff3f698a129ac09104f379caaab6e5385e8fcf2a8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 16088 bytes
font_02_sfnt_off0000ef51.bin
802cd7a38b741e6dc3659c20fd2a5139baa0d34219c50c32b2e28c895e6a4367
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10700 bytes