Malicious PDF — malware analysis report

Static analysis result for SHA-256 99169f2fdc2981c1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 17:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 218354aa0a5ac6ff340d29ccab8e5a0b SHA-1: e36c238785672409ef7e0ad7501781704258b958 SHA-256: 99169f2fdc2981c12cb1508045ea97e19aba203de3c9f1347843fc3cf0cdf2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614184c818619---2410698731.pdf In PDF document text
    • http://kvrhousing.com/uploads/39209459572.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/bekokibewuderatefotex.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/50198011197.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/legipexusubi.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/91602669018.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/69260036588.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fujizudilajaragafetet.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vufogedivitori.pdfIn PDF document text
    • http://gr-chem.com/upload/files/43642362117.pdfIn PDF document text
    • https://computerzone.pk/file/wobetijojano.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/98476432279.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68f9c94f4c4f6d50f9d6d4146a2e47bc/rikasimu.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/rakefibibezafi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/feluwuwifolekuz.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/81664451562.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/runosilek.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903101653.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613319b1dbac0---gopobutisakidesisomividu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/81852959894.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320cd605dc5---laferaxalotiro.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/20932789411.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/furanadezaritizeduxojab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+quiet+place+2+full+free+moviePDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 17500 bytes
SHA-256: dd6e618a1a087e31e6ac52436894eaf1207f3f3aefa6d6ef3aaec629a2352635
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 10784 bytes
SHA-256: e4a0c6e12031bdb81dcac4b2f69dee355fa1d9c0f0ed0bca35bc1320a272c1ba
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1