Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3807e493ba15a01…

MALICIOUS

PDF

90.6 KB Created: 2021-10-10 08:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 655b745777398a7658d8fb6baa448de4 SHA-1: 99bda844a018edda1132f10fdea97473fd0cf2d8 SHA-256: f3807e493ba15a011030e2f19574c1fc08bd4b810aac01577704851a09c75a4c
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 a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, aligning with phishing and potentially further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161559db523448---48100305256.pdf In PDF document text
    • https://ziyang100.com/userfiles/file/art_16338298563196.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/9426657105.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aa874c015c515539940d538157b91630/12887565895.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/xajisovuw.pdfIn PDF document text
    • http://cjatkinson.com/userimages/mafuxufejepox.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/62330633001.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/33286513005.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/37005459734.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/73493780051.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepigenezigomosuwikareguz.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/pokufofa.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xavegifaju.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/beturiretal.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/73717355403.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/69856717884.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/zasiligadusa.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/15652978782.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1763b6a42---daxagameweko.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/91634982389.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/50676577011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=inflammation+in+stoolPDF 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 extracted file (font_00_sfnt_off0000fb95.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000fb95.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 19888 bytes
SHA-256: 3ecf9374a50361420b9a7e45449a7dbb2ad4231cbc6a1f648b93bc8d4fe3f485
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 10096 bytes
SHA-256: 0417879307f3478180e7f82345e2a6ca5ee7145da03e75b79f65078ce09e6259