Malicious PDF — malware analysis report

Static analysis result for SHA-256 4891c81fca760920…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 23:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e9d2669f83ee0db5e2724fb321d7da8 SHA-1: 6f78114becde620c14f3b14892fd3fa3896103aa SHA-256: 4891c81fca760920d4c6bcfe165605fc0fc582a17d86bfe724b5eb7699c6d109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=survey+research+sapsford+pdf PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f1273ac8e247c04770f1f09255d8508/volizupowonujuloronejud.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/wagifajil.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f4be3ff0fda64f9cff3d5c597e916cff/13641978171.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wozesufelikafim.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7svo695a5jkujs5qp91v32b23k/sapurufamevikikimun.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/79004138718.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/50508512153.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/39733199327.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cfbaf7f3---83982360035.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/98683608205.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/v4gud73c16r705tsd33t5i2s9j/11665303825.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107232102417919.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gadanakegi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/lawisupexulox.pdfIn PDF document text
    • http://12shio5.com/contents//files/jewavupomodazojifar.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/21392171379.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b916e47cc711bf9ca251cffab73bedc3/tarawolorigovudimamu.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/toxexutukerofofefizub.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/47715534030.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd656b6fba---73882587896.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/bojoveseroboso.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78287bf23---30877441901.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/7fc3dd3e5132c82d7c94b302024ef77c/4116484493.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/37493363443.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/84a033b44fa84975aa7ba36372157746/dewofebebimupurogikevugi.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 17828 bytes
SHA-256: a0c0e6865bb60b8eefd88e912806d60c083ecb28cf24e0cbdec4e0e686eeddd2
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10732 bytes
SHA-256: 929fef1428c299b9d5d446f78d6a2dab71d6a69cbd4203ce869cb4a31cb53630
font_02_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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