Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a4a6acd542e1f5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-27 12:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e67813373807bdb75189c25ce2df6cb SHA-1: 61a43b44df6cf4eb887719323ede01f463401070 SHA-256: a2a4a6acd542e1f59c5a94823de3dae108a73f69a1953d4860d4a94100325471
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' in one URL suggests a phishing or SEO manipulation tactic to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://philabc.ru/uplcv?utm_term=picsart+offline+mod+apk PDF link annotation
    • http://vesimport.ru/userfiles/file/bilapojiviwodigemejiwowu.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/xasat.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/povuvel.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092323055271.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/bafuv.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/rivevere.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kinipuzera.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5a78979d---vofepufijozipinozafaso.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/wabazi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2lp7kvv7mfonmve1sqv90kn4j2/gofilat.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/jisubu.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/tifijazuberowabeko.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/38928569862.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/53860462094.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090513423095.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/puzarexodonanotoneb.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mituvazasiluxinipaxa.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/tofexelelofagotavetopu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/97306091594.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6d36c310698b131c323d688226e518ed/baruwubaxevekaboxugose.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906134721.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/32068739556.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vasuwipatoresop.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6a6a4973---xijozuzital.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/41292990558.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 10876 bytes
SHA-256: d2f66a233c3bdd979edf09fb4ef1fd7e9c74639461cca543dee904ff6e378a7d
font_02_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 15440 bytes
SHA-256: 36a55f2b313aab04a2d7b4b0291469ef7f74dbbb12462fa274a7e2b5a694b29e
font_03_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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