Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffad55d32d43768…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 05:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58be63ca34cd1660e6ba82167dc5087b SHA-1: d6c394123a434ea29b3b168b8daa7c35101d9bfb SHA-256: dffad55d32d4376867d991b8b494d59a2e9370233752c32b6e4d5548d7205afe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://kossuthdigisuli.hu/userfiles/file/mupukolimar.pdf In PDF document text
    • https://digicpictures.com/downloads/jirovodaranaxiwaxa.pdfIn PDF document text
    • https://digireg.li/upload/xilusegimasemuli.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28123668572.pdfIn PDF document text
    • https://sapporopools.com/contents/files/77504341518.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc5b4cbe---24587956288.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xagarinaxibavutogozizaj.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/45703363176.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/90253894259.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/jelemeravopebuwomonuso.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafufoj.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd52a76886---78031077777.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/tenumamenoma.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/dikatomad.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/maweluvanavod.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/83148416177.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/115268946.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/wilalifomulezala.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2ef4ef5c4f9f59366dd4185bd112a68d/dusitiwomox.pdfIn PDF document text
    • http://archbot.pl/files/file/86392226218.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/61739465437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=locked+up+movie+free+downloadPDF 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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 17256 bytes
SHA-256: 9c3f03672d5b2e73cbbabd88e323bc397fea0bac4e34e554e380ffd4dffed6c8
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 10816 bytes
SHA-256: 2f470a9a3402fe2a29164d3228e69b28e0b8fa21abad9a3829590bf6c2db77aa
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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