Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d9739609ad2f69…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 02:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86b6b8d06fdc50b9bc39f11cecf8689c SHA-1: 4c97b0d063292e3a23fae2a425f1ab7b1418fb88 SHA-256: c6d9739609ad2f698e2dd746f944c2174310355a76514bd16b0f5e5f2bf999da
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to external PDF files hosted on domains identified as disposable or potentially compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains to obscure the true malicious intent, likely to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ghinelliarchitettura.it/userfiles/files/mofofabivojejad.pdf In PDF document text
    • https://penzionradvanice.cz/res/file/21890672181.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/5818082189.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gafagoporu.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/bitaxesuwizoronokalugag.pdfIn PDF document text
    • https://rm-parketi.si/uploads/kejebeluv.pdfIn PDF document text
    • http://tion.hu/upload/file/lopogomulaw.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/53294841156.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139834ae5dfb---fopigumemofasilojazanig.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/nakitawigepeko.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jjfs6iiqs3vi61bjspc2jqn0jt/13074619075.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/43739956599.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/wulekolipadajetefodaja.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://corpus.bg/files/fck/file/76379701314.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/pupof.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/33501467996.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kalarumixumesikugabe.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/uhd1f84n76dibok2f3ds1j7ekt/1130417308.pdfIn PDF document text
    • https://finliz.lt/i/File/didekawab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=programa+para+jogar+jogos+de+android+no+pcPDF 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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 10844 bytes
SHA-256: 0292d9ba97cf8d284bcf90b7d500b639b85081d196f97a20529a93d76ae5190d
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 19140 bytes
SHA-256: a8a765afb73371d92d1a13ac0c4b87ee0b5f288b864b276b0c45772127aa0142