Malicious PDF — malware analysis report

Static analysis result for SHA-256 855a0b80985d457c…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 07:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39f5f22f4954ecb6263d200ee6cc2b1e SHA-1: 58f9f1bdb6a8dfd6969242260721e373b2f5b35e SHA-256: 855a0b80985d457cf5cb6cd0ad3975a9c0d6c58835896d6f38e329eea1051693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=philosophical+and+sociological+bases+of+education+book+pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096313254136---43125807646.pdf
    • https://activepymes.com/pub/file/jutizog.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a917e6c2---12448374970.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ndoq7cp2d1eps1aptan1rl64p7/69148169640.pdf
    • https://tecnibat.net/uploads/archivos/redijupumu.pdf
    • https://sunarchegypt.com/userfiles/file/goribizeteva.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfae370c7---womasumepixaxikuwatupevul.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837a3b95ca2---5901738840.pdf
    • http://sarljarry.fr/userfiles/file/wunirenowugikisamiruwa.pdf
    • https://narimasu-chintai.net/jcfiles/file/77224801076.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870d4e48c29---88644638818.pdf
    • https://atl-50.com/files/file/74993626436.pdf
    • http://etasystem.net/userfiles/files/37189246626.pdf
    • https://tavio.ru/files/file/manutiralu.pdf
    • http://cioccolatogallucci.it/userfiles/file/miropaj.pdf
    • http://ncabhsa.com/clients/875427/File/popexosinufelakuro.pdf
    • http://absigorta.come/file/77970825404.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a27ff66fd684f509a8250144b8d2ff27/dimejozugej.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qull2j6fqvg6isbpk57t9d1trt/87506699633.pdf
    • https://arab-hams.com/Ups/files/ridadetaxeluf.pdf
    • http://hanasushipickup.com/uploads/files/fetadasax.pdf
    • http://syuncyoku.jp/upload/file/kinebovozap.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160badc8cb6e78---visediwimon.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a3f238e---94539194392.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/l4967r5a0sqihf6odctl51kjdl/finaxatugikofesiripubam.pdf
    • https://caribemed.com/userfiles/file/16189077136.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3a48989de274a02ca115fe584ab25f5/74092201802.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_off0000df7b.bin
5e96ad816dc90fa89c2621ef19a1d24898ce23941540a961af24ebe199505fac
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16984 bytes
font_01_sfnt_off00010ba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
font_02_sfnt_off000123b8.bin
a5f3ba22df73648ac1fc42ff94931a31b32d11098836124ed600a5dffdde0280
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 11132 bytes