Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fb72b5977d6958…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 17:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa79a5e1b21d4956af1fecb789fb3959 SHA-1: 0bc8cff3837f171a6fb5556a0f7dac2120d9fb19 SHA-256: 11fb72b5977d69583ebf405dc38d4cf55f2afe97da0b7fe6fa433ae7325cd66a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=investment+memorandum+m%26a+pdf
    • https://nguyenthelong.net/userfiles/files/60388837468.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eff9d30d---63978963552.pdf
    • http://plkorea77.com/ckupload/files/japinegijumipekiv.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/43948744052.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d7ce06f---14089227762.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/voxazagewirapu.pdf
    • http://agrocare.hu/ckfinder/userfiles/files/78778977982.pdf
    • http://metzlerranch.com/userimages/xubovagogumagujewov.pdf
    • http://dongzzang.com/userfiles/file///malovutefadumu.pdf
    • http://farashimirooz.com/files/bezemivisobozobazobizex.pdf
    • http://0975811252cool.linker.tw/files/mapofoga.pdf
    • http://bekkercoon.ru/ckfinder/userfiles/files/gipitapobipakugoloz.pdf
    • http://ecole-belair.com/ecole/file/pitanibogivofakefixigor.pdf
    • http://safiorida.dk/operatori/userfiles/file/41820426223.pdf
    • http://dragonspond.com/uploads/files/bidetenojaxiw.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/takamekevogalu.pdf
    • http://pedraferro.com/files/files/79839392760.pdf
    • http://solamsys.com/userData/board/file/foxozir.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c181d6a50---sabudobisunuseb.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff64dd1685bdc89cc74f6d43c5035ef/kedidinunagirixu.pdf
    • http://pro-group.ru/userfiles/file/nopulesajixekalugaz.pdf
    • http://klenderbio.com/upload/files/sozexusog.pdf
    • http://tencanpowder.com/d/files/sulilemabe.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_off0000cd82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16792 bytes
font_01_sfnt_off0000e599.bin
1efbc53dc89a01aef8d89a2871a6c81da9ed23651fabc9c242900687580e4218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 10388 bytes
font_02_sfnt_off0000fd1f.bin
8f1f1c9a3184a4a01eb95bed7a1ae71058de7dd6d8f943cb6142307163ddff96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16520 bytes

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