Malicious PDF — malware analysis report

Static analysis result for SHA-256 24df78ce71082e3e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 06:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 444ec485ec75d07a8825fdac1f654fd3 SHA-1: d489185240e4a01f1f48f01fb8684c0b3e4d47f8 SHA-256: 24df78ce71082e3edd88a24788efbc0cc76e768a5d4bc7fb71ad62bd047afd5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were extracted, the structure and URLs point towards a phishing attack leveraging a link farm to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140f54b51637---sinaxodenesurujib.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/78637165588.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/29491019779.pdf
    • https://dianthusindustrial.com/resimler/files/29238296905.pdf
    • http://steinbach.casawell.tw/userfiles/file/lobogovijodujolisinajubos.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6717887e---kojuf.pdf
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/ponasexup.pdf
    • https://cmfnepal.org/userfiles/files/8227163250.pdf
    • http://neoclassicalmansions.com/uplds/file/jafazazu.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/34172056187.pdf
    • https://global-product.org/CKEdit/upload/files/padavogipawod.pdf
    • http://protezas.lt/i/File/rutiburile.pdf
    • https://groupunsur2.com/contents/files/93724707219.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/52806010400.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/poleralosatinima.pdf
    • http://nuitsdartistes.eu/images/file/tunopolomipus.pdf
    • https://cafepiolho.com/uploads/assets/dubutit.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ob6993uf5pll52io1l7104lof5/sebavu.pdf
    • https://nsaimmigration.com/userfiles/file/57184163307.pdf
    • https://chataigne-cevennes.fr/imgs/files/doniximumijele.pdf
    • http://dinskayarealty.ru/media/file/pepeledutotulod.pdf
    • https://happy-playground.gr/uploads/_uploads/files/78976164557.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fortune+game+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afff.bin
0da438f2f7ed2d7d7ba90e46caadb232c9e4d5c901fda94ae75729b6d735729b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 10460 bytes
font_01_sfnt_off0000c7bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 16792 bytes
font_02_sfnt_off0000dfce.bin
1e8d6d50b705ea13634bb29661ffae783f5626afc1875ec798f53e927e4bd1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 15856 bytes

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