Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f67b1ab3b6ca0e3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 11:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b18d56414b1144fb9a47ed74088ab08a SHA-1: 64dd84ca810e57524445ae0f7b65e1823d3be468 SHA-256: 1f67b1ab3b6ca0e393db972ba5c876a28efa6c09d853380bdf7d6457bf3ad02e
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a likely attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://safetypadlocks.eu/eurostyl/photos/file/49394671153.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/45579991495.pdf
    • http://fermobkorea.com/userfiles/file/20210913074701.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/5076873063.pdf
    • https://www.karelo.com/uploads/File/tobijonezabulaxovuta.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c0d7531270c8e750957c78c0c31e86a8/49896003564.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/42062078284.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a446b85a332aa5771108cdfe0cd91198/viwabuvujalufosozak.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mijubamonujajanopepe.pdf
    • https://questyme.ca/userfiles/file/62343719457.pdf
    • https://unifor975.ca/userfiles/file/gasozapodi.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/3808252247.pdf
    • http://lt101shop.com/userfiles/files/64337869073.pdf
    • http://okfilm.kr/userData/board/file/70134757515.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/9855074500.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19e70db4d---92007421659.pdf
    • https://liho.cz/UserFiles/File/50756294423.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/82079697372.pdf
    • http://mtsskzy.com/userfiles/file/nureloluxotebeb.pdf
    • http://faradbox.pl/files/file/52358372832.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f15f170---9280028648.pdf
    • https://webtechnocrats.com/upload/file/46749876777.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/zunutelu.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/94332444531.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=car+x+drift+racing+mod+apk+latest+version
    • 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_off0000c4a9.bin
2b49bd7e0bf9cd41d0a8dbf730f8d78779400dd926c5faaf1721e5e6984dd9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A9 11252 bytes
font_01_sfnt_off0000deeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16792 bytes
font_02_sfnt_off0000f6fd.bin
dced655002bf36e3933bff2231bd761b084cbff0bf0fb0b68e29fb79f2aa7b48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 20096 bytes