Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57bf8687b629537…

MALICIOUS

PDF

96.9 KB Created: 2021-09-17 20:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a16cfb00681b0b0ca66a063110f8abe SHA-1: a35c3e03a7459221e85cca052d2a13390fb16d51 SHA-256: f57bf8687b62953793d70b0dc0f6d8d1b4ff9ee016bfd6d586c4dc6d87954a35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://allytemp.ru/uplcv?utm_term=vidmate+app+download+for+android PDF link annotation
    • http://gamax-moto.cz/data/dokumenty/13575989870.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/piloge.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/30173274905.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/34995017046.pdfIn PDF document text
    • http://findusafranchise.com/files/files/ruwisaduzas.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/60735210110.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/sopikelagoxozimokajog.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tabitaxotapugezugotox.pdfIn PDF document text
    • http://cartopack.be/Images/file/68067072672.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/lomutura.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/41523073687.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e092bae67---sosifajidulogopifixif.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/60562070041.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gifiwikaxavibojusakurade.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/32047732945.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/16072187518.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/20218184472.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v9nm6vadn8ghtl72ga7lagrdtm/28730046805.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/47078753305.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139eaf4d5265---ribajevadozazevanob.pdfIn PDF document text
    • https://datenglagi.com/contents/files/79278252500.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/98957810145.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808d9859dc---suvirawujifubekokuni.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_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 18084 bytes
SHA-256: 177c44506c49dfb4a93f09b97bd34657f22fa972c756d98d5923df837898e0c1
font_01_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEA 10548 bytes
SHA-256: ccb1ab5f319572662f7ee007a869a557027b3c7f402ac170055bb97d6167b7f4

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