Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b95921cd1d3337…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 17:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66b85107d3e971a1f2e223a828362c86 SHA-1: a5d78c1f9e65a4b6d99797ffd601a21fa02589db SHA-256: a3b95921cd1d33372742698c3908195fcc477308fea59a3f6f0e472716bde845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=galaxy+essentials+widget
    • http://aweibel.com/Photo/file/49193332142.pdf
    • https://wheelmartthailand.com/image/upload/File/40007592160.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1418cf9---petiwovapemanukusasaxogag.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/nofajinupejopumeb.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff142ee8f0---renefu.pdf
    • http://tao-oita.com/admin/upload_filesfile/23741091825.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/264470f5220f58f47633486dc15b14a9/kenawasimipovozedurizaze.pdf
    • https://houstoncoinclub.org/FCKeditor/file/paderelerelisadilitagux.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff673038ad---wufevajudar.pdf
    • http://cappellastudio.it/userfiles/files/xisinudufupasugije.pdf
    • https://kaparatt.com/images/File/86110489039.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/16040634569.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e447eaf5---14546404824.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/71565025086.pdf
    • http://szpk.hu/_user/file/fajexurukadafede.pdf
    • http://richmediahouse.com/admin/uploads/file/mubefezuzotudeg.pdf
    • https://kingwrapcarspa.com/upload/files/botufixeleneneniguro.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d0dp2shmtq3icajcij4unebuc4/80369848325.pdf
    • http://damosushipleasanthill.com/uploads/files/zuzusimuzemit.pdf
    • https://mimpishio2.com/contents/files/17909652719.pdf
    • http://tdjl.com/uploadfile/file///2021090604342358.pdf
    • 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_off0000c37b.bin
5340968d17faf8c31a04209fd949d2db76fcef7489fd3538cf3b3296d2ccb6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 10544 bytes
font_01_sfnt_off0000db88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 16792 bytes
font_02_sfnt_off0000f39a.bin
8baa6e9cdd569c8eb0efe80f25457211ff4f4ecce09022da8c45d01119047697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 18320 bytes

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