Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6dbd759725928…

MALICIOUS

PDF

114.8 KB Created: 2021-07-24 05:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6660818fd39a349d4c6b473a088d9d9f SHA-1: 4b9f59976ad3f2d72f1acf059565333123f9a1ec SHA-256: bfa6dbd7597259287971877d67d77c7dd99fc33807978f2c676c07ecee1ada76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tnslib.su/userfiles/files/xijazefisip.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3i6ribf7bvhmib4unfijj85ip6/97854478953.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tigiliparulu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/87512288945.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/58fb3d4f7803d8e861b4d35917c1f572/sagafisojax.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fa46d745f66d96f59b2b54060c60e239/durofodavijojijajawegoma.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/62852588487.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/tulunimu.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekiladalifikazux.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210624033143_isz0pm.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3631f121a---vizoboxesafulutin.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/womurojafixiwipatapekumug.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e516a4acd4f---mugidabugiza.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/mixirubexegojezowubolete.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607860f44f477---zebesexagupeko.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/84701318610.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9e1gs3o9ooo13keeqd9bb2s8e/60587349865.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e89923781b2ea513c9ebf660ce313ed9/xodavufazixut.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/72327225533.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/73970208377.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/46186284429.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f1c1b9496c1eceb94ae2f849c368d628/vejojilejako.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/75181728065.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kexapaxora.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/16354189992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=juegos+para+aprender+mecanografia+gratis+en+espa%C3%B1olPDF link annotation
    • 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_off0001573c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573C 11260 bytes
SHA-256: 79c2921451e21499fa72c913e31a25b01d100d1016a6af749fd5337271e12da0
font_01_sfnt_off0001712f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 19632 bytes
SHA-256: 7b5865587b3ef2ee249268b3d401e0b62650801282bd9becc48da2d214d61b77
font_02_sfnt_off0001a272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1