Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d0704646639d84…

MALICIOUS

PDF

90.6 KB Created: 2021-06-28 11:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a744f5853bc699dc0aa828f03428e7a SHA-1: 75de927f112941a741e206cdc235067b4eaf3a25 SHA-256: 35d0704646639d84163c8f350e4ffbdab059847388dcbcb6a5a86d3d875a261d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, with some URLs using 'utm_term' parameters suggesting a phishing or SEO manipulation motive. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://archism.ru/uplcv?utm_term=swot+analysis+for+poultry+farming+pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440a5383df---telitawejezazenibafogobof.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f821soedbm2dhe7r7oo2j79r15/65170178218.pdf
    • http://alexlunacoach.com/img/editor/file/57555334531.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g3mrmo57d8mojsssdtconq30f3/60454407702.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/845d7ec84ef87c2147287bd29ad1e923/69686002534.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e6a96bf9c71a5dbc8834c84093d42c66/65362668973.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i2vnps864rn2v5n383doj31g6k/86065992299.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075903b940e1---53566494153.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/771f8042d6b8af7fa948cc4809f7c5ee/wuzizavuni.pdf
    • http://ajivikafinance.com/userfiles/file/sumidarixosetokuguluz.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d9b87479---20908302224.pdf
    • http://derma-dts.de/files/file/vexov.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd9f99359---69034110633.pdf
    • http://nfraccon.org/userfiles/file/datodusamevalukemuto.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c13f36dcf---8625759994.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3f54e1a3---27727792529.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f955d46c48---47685325165.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0624faab---46458846697.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/fumivibimuxemolinu.pdf
    • http://gayaarchi.com/userfiles/file/20210603012546.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/raxatanutekezow.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eec0357a7---81397817099.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af35953383c---27468303197.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d44948b43cb6b37d1157c531d078f32b/borelisuko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73b.bin
5696bb0cb708e339af6a4faf53c07159f41538e872eecb58a9199ebdd66e1e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 11084 bytes
font_01_sfnt_off000110df.bin
0d2a1c7db24576eb9ae9d051c24fd0c715444340adcdf1e985f2860fdd21a2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 1980 bytes
font_02_sfnt_off000119f5.bin
88ee11c8b91adcc052ecc478e80ec46cd8a9b40f0c85a289e5b0e53a80e56317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16412 bytes
font_03_sfnt_off00014451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14451 16792 bytes

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