Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eb1f723797008d…

MALICIOUS

PDF

88.9 KB Created: 2021-07-29 23:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7083af6297a0fc283e9b61bffa62ad2c SHA-1: a3d5cc55f281981d5cd76eac3acb3e9892dda3df SHA-256: d8eb1f723797008d49c02fb7e268cbba5d030eb01418f8be51f8f3b58ab15770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to manipulate search engine results or distribute malicious content. The presence of external URIs and link farms indicates a phishing or SEO poisoning attack vector.

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://gelikonline.ru/content/Files/71355826894.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/tipugemekevo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75521814686.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gokovif.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/27997cgi3ts3j3bel5tui44aub/kufusakega.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/77573280656.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/wenofitimaromujajijosupu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd975c2b2c4---47651890776.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2c5a090c---masudavigenufe.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1f3e2dd4fc2006b13f2f896d42933b46/kixefikepub.pdfIn PDF document text
    • https://siroyensao.com/upload/files/topamufojokig.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b3800a53---10494491770.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38d84e19f---lejomi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/26e73f472d2b64bdd492f541486dca08/36032897381.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m7vu106403nqgtqrcm5r4rgbb5/56078925203.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4b6518e6f1e41cd4e75da827c32158e/79399825247.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/28014609994.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/rojirebefurowom.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/50834520097.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/56057047522.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/kunupe.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/titinugemufujewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=big+nate+free+download+pdfPDF 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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 17836 bytes
SHA-256: 4fadb3d17e82c61dbb3244595f7e119efb70278d27a862c063a3d891435a65a3
font_02_sfnt_off00013da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 10644 bytes
SHA-256: b47f21160e148ea972019731493cd632029bdec185b4a3350caa4cbd3a8120cf

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