Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aff1a52d814eb2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 23:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7a0b5af271c0661be2642ab8f8fe4bc SHA-1: 2c977653a5e3be6d57c2e6594760f09af42f0aa8 SHA-256: 50aff1a52d814eb2cb00a19bfa2b2333a15e40ed3417d73f0cb62598753ea59e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely to download further malicious payloads. The presence of invoice and payment-related language further supports its use as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=material+management+questionnaire+pdf PDF link annotation
    • http://fresh-j.info/images/uploadedimages/file/51020659720.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c858fa82431---46212670633.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/dfdf251ee89276740d1b1e8a15147242/nasedamilujapamano.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/35563723179.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6a98ecced7f70bab0db65ffff8c5c27b/25505627807.pdfIn PDF document text
    • http://usagimatur.com/files/others/nufukaxamezodipin.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/627119fe7d034e760fcc240d12480c45/sidedubagosomu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/bekaxiwu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6591395324---70481005454.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/15990529037.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/32571627317.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/18856442669.pdfIn PDF document text
    • http://getvisa.ru/images/File/59096190279.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c18bdafd9c4a44967cdffc6edc66fcb5/jifipunanajenun.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/99882394107.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/zagonipijejenisamibo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gotageguxobubibu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/79710576554.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a01fd4c1d7455096ef548abf214c268c/44972842201.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce9775451---walilonal.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bekositolevegir.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fomobonezorunirejoluzup.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11080 bytes
SHA-256: adc04e6bbbe4a4d0b36a51c95e7f7b674f9cf65ef6db4ad537b6f7926af8804e
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 16676 bytes
SHA-256: 30146bcaa0ac21be10022c2b017ff502cffff8670fb828150358dc282796c528

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