Malicious PDF — malware analysis report

Static analysis result for SHA-256 111235050f074d4e…

MALICIOUS

PDF

91.6 KB Created: 2021-07-03 13:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46adf2815d0633db5e738419d364bcea SHA-1: 3a27b5236ec94a6da1c67d6b3dc67074e2cd72b4 SHA-256: 111235050f074d4eab33cbd3ef9d1e45cbfeb6af0ce13268ab38872b0437109d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://win-sonic.com/kida2018/ck_imgs/files/79481409452.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a10b8f52ab83bb6388d120a6c6ad8c29/15328722461.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcee75610---76116353421.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1328c97944a2aca27dc1d37fd3c05f42/bovojofadanujaj.pdf
    • http://iburgisidimarsala.eu/userfiles/files/85820064280.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e93153182---nojiwob.pdf
    • http://www.tobywells.org/media/fckdir/file/pekiw.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7eeab8df9aec2d08ddcb73920763fc66/zipuxijifat.pdf
    • http://northcity.rs/slike/files/duwoge.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/29c57ca77f25823a4b82c4f79c2302f6/lipidesuzonexodedibozenik.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f211e6bbd9---61007319610.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80d03d3e7264be91cadd3667968f4b43/84192800042.pdf
    • https://1877painters.com/FCKeditor/file/bajubiz.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cb920ba0a44e2af3d9f531a523cd067a/81749547043.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/sgjct1hjkmdtm6kif49n5l6lf2/62814699067.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/halk1suvo7bqi799dbujtfk60l/zozafu.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a90gn8lm308g3igdm24og335s1/ramofejojuwoba.pdf
    • https://iwnta.com/userfiles/file/59338485321.pdf
    • https://aymsoft.us/aym_image/files/motogulijanekega.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/714659a829d14e270a87673215bd40e5/47287956749.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d563cac8---12048114574.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/06c8859cbb49151b51ab49fe473718d3/vofefivelivukukivuset.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=startup+feasibility+study
    • 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_off000103d2.bin
79259efaaae9b12165c2ebc0a3cc832e7a2fbca0563dbd4f87b0314b75d3c834
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10696 bytes
font_01_sfnt_off00011c46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16792 bytes
font_02_sfnt_off00013458.bin
b554d5ebc27d1931ed95c3d5de7c350152a53000fd14cbfe70a96ad933b7b505
pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 17372 bytes