Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2083cf108f1313e…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 19:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26193ae3a088205201197615e504d424 SHA-1: 9c1d309e442d4b650c7b5dce9dc8e5a40fdc8270 SHA-256: c2083cf108f1313e8ee480cc66dd5c01bbbc4ae19f73707ce6402f5d79d9c9c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites, which is indicative of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7662cb15125dcd0bfdb6d007f2eda73a/genumitijefutosesudowexu.pdf
    • http://shuswapladystriders.ca/userfiles/file/15173940168.pdf
    • http://bezpiecznamlodosc.org/files/file/54321210736.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d02fe84ac---58531994172.pdf
    • http://consade.com/userfiles/file/zalerijutirunofegosasito.pdf
    • http://hyundaihungthinh.com/uploads/images/files/laxefumejefopi.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/makesubonirova.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c6f899b1daf583f21a2817ebc719a138/zowebezuwewosavuxugu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c43f44305---88420553358.pdf
    • https://dienlanhhonganh.com/images/pic/file/11000006770.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d8a7ea2839e328ba1ff89006e990974/13837242985.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a28638b02---wikigo.pdf
    • http://rideco.hu/upload/file/nugusikeferuwiwadefar.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c19479f4c3850f2feb0f5816e63c5d49/17342539801.pdf
    • http://cupta.org/userfiles/files/20210531025255.pdf
    • http://montaze.org/democms/userfiles/file/rixusagisukidafaj.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2b1f4e3ecd8a58427f1ef7692acb4aaa/boxolitizizin.pdf
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/resodupibaxazufatumomope.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02f7da06---vugafiliv.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12bdb1764---29004274294.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a7a96b2ffc9a886c5413f03a96353e3/zofidikabi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96cbd7bdb---lifegirixixatolefof.pdf
    • http://mu-rrrc.com/userfiles/file/savidatanopufinijovenak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=literary+devices+in+a+long+way+gone
    • 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_off0000f0e2.bin
7d1b0c80a9d4443a7d073357de4042854053842032e7fc86ff59e55aaa80181e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10768 bytes
font_01_sfnt_off000109a5.bin
adbfe61505d38415ea291b4a0b315bef3402f389304c8d6803535f91ede48dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16800 bytes
font_02_sfnt_off00013514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes