Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0ffe2c02d8caa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 11:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe2176c9ef929a9826838774968be797 SHA-1: 811d12ff0a150ec34d22e80ea8a3c224a026e229 SHA-256: b1c0ffe2c02d8caa7df4ffadfb9e5e1f242d41ee81534e5a2a16b79bfe7f88e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further indicates a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=how+to+read+qr+android PDF link annotation
    • http://biosystech.com/pdsFck/file/fosidigez.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2465426542.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/4920442500.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/4109994225.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/3113204297.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/josovavenuvewo.pdfIn PDF document text
    • http://santeh.md/img/files/pixenujefiruteji.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/41723598209.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86400528369.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/35455539030.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/tanajozus.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/22962966132.pdfIn PDF document text
    • http://allier-genealogie.org/File:/55205864717.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/95466584246.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32a3adf97---19376274277.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388f93e869---peradafubakukot.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/noxuxotariwujototun.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/42727492943.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/bigikaxonejusamir.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesemadasobiwulo.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/kezaxepumepo.pdfIn PDF document text
    • http://sakem.org/userfiles/files/42841261990.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/dimarivotizetiza.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/36010053226.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17008 bytes
SHA-256: 7b7ff5d08ce1b51acf37d67b6c18a12e04538f73053b1ee21b4df267149ab52a
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10248 bytes
SHA-256: d5aa1d5a447d4c3d0e4dc4a21cf760f010a0261a02854f7d9e0b5da2c4bcdf85
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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