Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21bee7a1dc82690…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 19:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d8408cdb7516638ac23ee83d778b3ed5 SHA-1: 1c83d422302398cb517332f56faea78c06799482 SHA-256: b21bee7a1dc82690e0a08d99df85dcb9f209ee00d53e7855b5397e94d991409a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=ps3+gta+5+hack+download PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69928ec605---37014139647.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64b087042---7782005898.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/7915611549.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609347bac9858---jidozedorozosidevedu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03538962e0---72391772390.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/gijobufedozasobagupeduwon.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/guwawiriviloretajixase.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d15e5ad2---vakepilogagidezuromaz.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73ee50e3c---68018619617.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/73861774659.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/76746355b75da7d4cf88938043247338/fukonunatufoxoxu.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/55145131342.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/78427384430.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc2db5b6b---98373037584.pdfIn PDF document text
    • https://samowar.me/userfiles/files/38970202118.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/809c44db39bce165c73bec3761466a5a/64645018653.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/901ce05b97c824b8a78a5a45e5ce157d/gujalokap.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/58gh5fgh1upvsdkvikb68nepj4/28362304414.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ribalowuwoxosev.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/49543587946.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a8b2d9543b17b17122ab613858614ff1/67953907615.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23799efb5---nuzop.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd00750eea---muwewadugedepuwizuw.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 10808 bytes
SHA-256: d8f0d4ecba0e68b0252e69a777c8f3647db5f79cca5cc6feb694c280179aa560
font_01_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 19720 bytes
SHA-256: cb39fce16061958e9fc051e996fd73ef52b9ffe194c975fe88cb36b54c99fbad
font_02_sfnt_off000146fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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