Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f763ed8807b68e5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 07:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23083a9c84cef9837d8867650668e6b2 SHA-1: 0c0db494cbe04bf4508dc363fe8f89d0d42f2423 SHA-256: 8f763ed8807b68e59d4facbe95a5a94e9e221aa2cb9de305889839909c9ebe81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded content are consistent with phishing or malware distribution lures, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=ipp350+ingenico+manual PDF link annotation
    • https://lesura.net/userfiles/file/90067246407.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/54262947022.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/pitosa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797eb23aaa9---lafalefar.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2b901ac0d---tuzeximenil.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/18058735166.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/kuzotusepewaxikeda.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5870dc92ca---53385209854.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/simadinofosemiwigexigik.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/ludadavivenebeleru.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610147cf3c32e---74540952543.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/44306bd8416d7bb782c63cb1d83ed463/dujarajetol.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2b9e4f01a4cdbcb4b2b8a484b63b4b39/32033432319.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739a4f214ce---66929901003.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432b660d1a---dajeruzebufi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f61204d6a29---24089300458.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ffl7d1a778a9f792mlrf6oo9/86061191528.pdfIn PDF document text
    • http://e-hematologica.com/users//file/19425912496.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/91658106854.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/25466595248.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105383b0de50---danigafoberapanalomufuze.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e8c07a84566309b7df02b04bfd48cad4/kazabotomenewag.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/2100789503.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/ferawogerevajatipesu.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 17640 bytes
SHA-256: 61fdb49a84e558e43097c39c3868857d00f97219b9c97efe77875300a190337c
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 10828 bytes
SHA-256: 39aa667d2c3e74fb717b7f237b66b443a3a8cf13e9da321568a72fdae945b1ec

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