Malicious PDF — malware analysis report

Static analysis result for SHA-256 f109fe2b3e2652c2…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 21:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58014c53c7c76ac05c05f97cb6d9aa53 SHA-1: a8a5d463d319a2374d16f6c198058ca80efbb36f SHA-256: f109fe2b3e2652c21267b844671b072fa0fab9172a303ea69c143a301af5b06c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

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 https://pima-alarms.rs/slicice/file/3220906531.pdf
    • http://softwarefactory.nl/images/file/mirusejenozadeselu.pdf
    • http://soflocops.net/clients/81266/File/mebabekebuku.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8bfd98b5---51577654286.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/3gi66h927m1neoicdltpkb0481/nokotozu.pdf
    • http://greenbrier101.com/userimages/lozetapazopiwuv.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7q3ppjbf0j77h34g9rru5e6ao5/80150645815.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c430141d3e---mitizedev.pdf
    • http://angarakshaksecurity.com/userfiles/file/15496876513.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a7c00a5a4d9a22df617060686c4847f7/diloxegitakisodip.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92f9ab193---nafezeganazeseputenopo.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dasuwibux.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095be41c9a2e---kidesip.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608743bb880b7---22039855563.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a4683170---78511301684.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/910f5vpun11v2q4s3opj5v1kjd/xejodewovereli.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rh9kjqa8d6pafka76u5jeok6c2/xalelenukononilirisa.pdf
    • https://art-lamps-rali.eu/files/file/26634896516.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/79493pc5ju9aeqnq9m6j12f4j5/34097120982.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5129c1804---wixowitapoboke.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd3623cad---57580841522.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a466740b---kisom.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb6e34b87---57911722613.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/896a724303a02601f362548485feb0a8/97836756060.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=words+that+change+minds+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_off0000e8dd.bin
a2bd53dd2f49721850c538751d6a52ec5e6ce7756fb89cb75a8938c30f74e11d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 17000 bytes
font_01_sfnt_off00011530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
font_02_sfnt_off00012d47.bin
fa6d3f90d809df53a472c1d7413e0e354a0be388264bfac44dfebec53c327438
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 11016 bytes