Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b6ffd407e2a4a6…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 07:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c1ead8dcb58f0615bfb4a162691ebdb1 SHA-1: d88c08f2e5567ada5c0a71eebf8320cbaaa9fa39 SHA-256: 74b6ffd407e2a4a619d992c1f808c439c1850d6b9715bb89730813aa31e403a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tsib1vp935g5vnm159bcqtjrp3/98902947053.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fae38c28a67---22908566631.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/78054392142.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/74fe3b3ca84ab636247bbed85f5464a3/96166136302.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/migodivupofuvisabososom.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/33449873573.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lajodimip.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/97199824094.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/betonixi.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/18706265136.pdfIn PDF document text
    • https://iword.de/userfiles/file/daguberajav.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/80498950525.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/sirubazolededidetubekasi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243a6bd3d1---fonapol.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/4432987673.pdfIn PDF document text
    • http://dentistturkey.com/image/files/88741942710.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/64594172628.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021520447545782.pdfIn PDF document text
    • http://tabletopad.com/images/file/98333500525.pdfIn PDF document text
    • http://landpas.pl/upload/file/tosobimebazirototutusinel.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8j61hc431ttakegbfg56dticsf/53821266702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pocketbook+basic+lux+2+manualPDF 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 PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 20128 bytes
SHA-256: 63be2a1711ddee03d6f307e20592f3d5704c0833ac719a83295b7f428e405889
font_01_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 10848 bytes
SHA-256: e4f360de3e7efa1499d8b1c35f5d04e99c56ba2a37781753a2c4865b8ca10d27
font_02_sfnt_off00013c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1