Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f6d0c6de607aac…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 08:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d391c9ef25774b4311dffa6df4fac8c5 SHA-1: 82907976841dbab06ec6507bfe17b1e43df14686 SHA-256: 57f6d0c6de607aac1ea2954c60e1c613bd4391f6104ab237698e2b65e63315e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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 https://pistant.ru/uplcv?utm_term=zoom+call+games
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/h4aipt1l7ulgt91ubkel1fjm6v/fifobibogofopalura.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4940f8af97---beveruluwamujalizopaf.pdf
    • https://recapress.com/ckfinder/userfiles/files/salisofesepozunijug.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833d145cd82---kovivejomanunisumumotuji.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/91685e8e9e685a56189ab55ac37aac81/ziwepavokaw.pdf
    • http://topenglish.sk/app/webroot/gallery/files/41325794675.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210526074955.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mapexubopupexagoraz.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d37973d202e2a611c54963400e6e3fbc/63930025838.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0obd3i70pevsj3qov667kevn85/faxubaluxexemabelowavotu.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/fajobifiwanulipamimoxivo.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0bf8cab8---totosojirika.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae024789886---luturerinabo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9c1a38c07f5627fa1dfd4c1eb82a05b2/xozawomefoxobedax.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/4b7rnm4ficn9kefr1kg0nmfd6j/regaxabu.pdf
    • http://okwmd.com/upload/fckeditor/file/74593312106.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9cf16f67---rodamezofojaxuwewepipu.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabcb37100---20726458300.pdf
    • http://vitacanes.com/uploads/files/1912755869.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/fusemoxax.pdf
    • https://ladangmimpi.com/contents//files/monajelobegerupefa.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5ed5584a93a0f6d99a890fa506a72714/xuxexobawijemezovetunofum.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_off0000f71e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
font_01_sfnt_off00010f30.bin
c898ed58830b8905f8dcbdafaf9cc450604c4d4f9f4090244188b730ab3006a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 17884 bytes
font_02_sfnt_off00013ddc.bin
c48e1a06377ad94a9363767fe3ff9a2bd400aecda35dd14fe18fa5035cc58e73
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 10140 bytes