Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f05d3c13eb18453…

MALICIOUS

PDF

112.1 KB Created: 2021-07-21 21:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0507c9fe80618cc9fde5e04f0f309a2b SHA-1: adac7addaf3db26275616ef2059ab1bd2251c694 SHA-256: 8f05d3c13eb184537ba054ef1de281672b8a0e66543a90a27fcfa50ce0cf6c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d29e0e4ec---xexaxusuvibezefiruki.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f45c3e0ad---78703068282.pdf
    • https://ferado.vn/userfiles/file/ruxevuzikerewitulezos.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9td58cu3v87coqlnv5jlmtlng3/14761057749.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f750df02---rutewozebatunofe.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670073e1e9---wedenebomitomijimo.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9233fe9031---rogogoxu.pdf
    • http://schubert-hh.de/image/file/savuga.pdf
    • http://greatnice.club/updatefiles/file/42395070640.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tinoleludeku.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f5hmqi3bp2nnlan8o3qrhqaoi8/41180794494.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeae032c67---wogakadisesivuz.pdf
    • https://permargi.com/files/galeria/files/luwipunasilimelupo.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3be8205df---dapoxalepovukef.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/23713141484.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/sehrfuialdg90o7d5oiami5oik/47402361487.pdf
    • http://hocikto.info/userfiles/file/82804330607.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d8fdf4158de6677a43bd257bf6635d0c/32420860706.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/muxibusutavuvopo.pdf
    • https://tenekedjieva.com/uploads/file/82950591121.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607352092d14d---pejexenomodow.pdf
    • http://shuswapladystriders.ca/userfiles/file/wijilojagelidefiwe.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sqnihsb1uh7ouunpe9mb5p6siv/46999446243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fundamental+rights+and+duties+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_off00015207.bin
35db4fcecf8c4b3366c47572be08fd7826e91e6de4f77215a00e8ddac5cdb254
pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 17924 bytes
font_01_sfnt_off000181a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x181A2 16792 bytes
font_02_sfnt_off000199b9.bin
4bd2d74480c3039412e073e3aa6b5b6cd3440c3465fedd9d0dfd800abb6950b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x199B9 10904 bytes