Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f412f7c83ddee57…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d60f45b46b4a8936d1c679b0e76d448b SHA-1: 81d5c28a5f3c0255805ec93f1973908892fc6fbd SHA-256: 6f412f7c83ddee575d849375cd186f1aa007c58f0ac659c81e5eff0de326b77e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on potentially compromised websites or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The embedded URLs and the heuristic findings indicate a phishing or malware distribution attempt, likely involving a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bjjiffy.com/upload/70413073533.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1bf5d0d8ea6512df37ba009ce50657d2/90928835594.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/wikutikezegog.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050803055895.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/ravebiposapagipuxoni.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/parukuk.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/5683395279.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a6a427ea---givinixupimib.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/86893302977.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/98898145549.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/36235391279.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784b667524f---79591796280.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160843f954a32e---xiwudapep.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/10112024152.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xilonefowekanejafigirodi.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/fatobafiwo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3ad9079ba901e9b8387a1047f2d15f8/70149170162.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096888ac97e4---17498705798.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943476b58f---46633137824.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/16525187890.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/jubul.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jrobu1c0r0lsc84f8p43jglam4/ligadasazunowegumul.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/87170469106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=synapse+x+executor+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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 17620 bytes
SHA-256: 905a924919af6456a9663763ece1f7aa0e4bb00ab7ccedd5455ff7d7e3d7ad06
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10996 bytes
SHA-256: e810de4626d62392f6de1b44f08d3a31997cc68675145cd668f7b3d65e162569

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