Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6b75659bcba2f9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acc060f069a093a979b410b33740078f SHA-1: bf8b41aca94fe9c06ff11da4375396338e391c33 SHA-256: de6b75659bcba2f98d9212f21c114598c07f29c054bb707d1e3cd4d95abc0dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jobtiara.com/files/files/45480601707.pdf
    • http://lifecare4all.com/upload/files/29220554764.pdf
    • http://zhizhencn.com/filespath/files/20210916221021.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d98d975f3---jureru.pdf
    • http://uktohabbarijamalta.com/files/file/gatuza.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/58051911253.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790aa21db1---34259884424.pdf
    • http://matsusushionline.com/uploads/files/2862896182.pdf
    • https://metricgroup.it/uploads/file/11367298645.pdf
    • http://devison-matras.com/upload/file/sebawizeveduvuvigugiden.pdf
    • http://giayviettri.com/img-ftec/files/26710734924.pdf
    • https://produse-zilan.ro/files/gejezuwolisatamufop.pdf
    • https://alihuata.com/userfiles/file/73733532262.pdf
    • http://ricettebiagi.it/uploads/assets/file/pozimajururefudeme.pdf
    • https://bodymason.com/user_uploads/files/posisenalitur.pdf
    • http://jjmcp.jp/userfiles/Image/file/83261350889.pdf
    • https://chmelo.hu/sites/default/files/file/lejajixerowidasanavux.pdf
    • http://baharev76.ru/userfiles/file/sutizamunovekem.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1aae62374---71718184235.pdf
    • http://zjbfjt.com/upload/files/98128900192.pdf
    • http://china-engine.net/ckfinder/userfiles/files/5863380651.pdf
    • https://hexema.com/FCKeditor/file/43878043720.pdf
    • http://danangsculpture.com/uploads/image/files/71994483006.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anger+of+stickman+mod
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bd.bin
2eea62b0c60d7ea9f02f68488b09b83499364f4556f51c2cd5f6ab8b8a5c3be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 18948 bytes
font_01_sfnt_off0000e235.bin
d4661da4dd942185cfd4ecad8610a972482ec36b909a3654103e0a60e504e6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 10844 bytes
font_02_sfnt_off0000fb17.bin
a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 16164 bytes
font_03_sfnt_off000110bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 16792 bytes

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