Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e5410533e4cb8…

MALICIOUS

PDF

90.1 KB Created: 2021-07-30 11:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c16af031a7f9d85e47fc9f7415eb942b SHA-1: 0ce95159c908bac53a17de45742e98aeca17b258 SHA-256: 759e5410533e4cb8c162a78b5516431d1c1ce533fa3722bd1ce75aacad7e508f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d96fd68c84fa6888eeff660eea3a63db/fefedopiruluk.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f9d741987---nirugaguvolidizudikux.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd7e68b13---11965427817.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6525547f08---55481295341.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/55405667480.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o6h0ag4dtvq45hu2jphatgrkub/wunizodezedaseliju.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/limulujux.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a6b1a35d---29984908577.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wozirujabiworijexegexuzu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922ec4631b---38309704981.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7ec02157aee153d6b8b1851d00952577/sisakedu.pdfIn PDF document text
    • http://traviet36.com/upload/files/76499463944.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab6c0ecf8---84998389022.pdfIn PDF document text
    • http://berbun.com/user_img/file/89943968465.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/gopezafolirekubojapap.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7hjfht14lpmgd24etp1ihv7q7j/3503281181.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/nokatevokoluluxuxofefa.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5142f9ad---zevogoxubububumaza.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73d339d92---32091862808.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/dajiwodonewibumup.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/644790131.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba1c8066fdc787551a5b4d5e3caa2985/remozupilogakonib.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8d63196b18799e5cbf2229ce4d0bae67/42474084216.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/72084753235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+transcribe+dna+to+mrnaPDF 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_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 16860 bytes
SHA-256: e31a9062071951b58b1f6a0e13c2155096978a6eadbb52e80770f74f739602fd
font_01_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14088 10916 bytes
SHA-256: e1bebe409cb7a5d9266fcb2c09ce8929c8d43840987ad4ab662ee64c4262c025

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