Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c01ba51013e33cf…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 01:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b01a41f581b8c229e442aae1e5f1d7fa SHA-1: ca0024ed7a72da6ee8d605a823cf7a0709e3a0d0 SHA-256: 8c01ba51013e33cf5d14bd949e13967e27aa2ed6bb90526b4011e1f181204406
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, some of which are associated with compromised CMS uploads or appear to be on disposable hosting. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rajhansnursery.com/userfiles/file/romojomuno.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7118d0ab---sesuwuwisavujawuzifele.pdf
    • http://eko-inwest.eu/upload/file/76653172826.pdf
    • https://brod-plovdiv.com/images/fokaxijufim.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0015f0eca82cd9f5c058fc6ea4f77e7c/7751465969.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd3fd7a69e---29209700653.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a844d688a5---49568876471.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pqjihsinijpgp3bhpmht5fl750/32722652613.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/mq024q6j4id4sadhcj5t3m296l/dovik.pdf
    • http://designpavelzapletal.cz/files/file/nasepekopamegomuwan.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389af6d2f9---22970905295.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdd8299f4---mumoxilojanu.pdf
    • https://chp-travel.ir/data/file/99535020319.pdf
    • http://www.iece.in/userfiles/file/lesur.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48b261566.pdf
    • https://wfca-czech.cz/temp/userfiles/files/kulowokapu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d7a507aa---59098683164.pdf
    • http://longthinhphat.net/uploads/files/zuzesa.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88ad7404294f08ca0f357ef72e48d58/zigimiv.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdfa7e52e---11233117647.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceab4ddd8---jewubojafupowuzorido.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de0e75e14---nuxulesugunipigolowadesa.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/nusisiserep.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/099917b4369a0f1a8f5f583eb6c91669/dijevitabot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+grow+an+olive+tree+from+an+olive+pit
    • 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_off0000ebaf.bin
e5166a583b327cbf677a5d613cba0e76a2dd0f7813f216babc1510ce780c11e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16492 bytes
font_01_sfnt_off000116ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
font_02_sfnt_off00012ec2.bin
623894b7aa0744c2646a48e823f70666d495353f4304ebb34a06b38e5ea10184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 10928 bytes

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