Malicious PDF — malware analysis report

Static analysis result for SHA-256 315ab948f38848da…

MALICIOUS

PDF

81.5 KB Created: 2021-07-01 12:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d883e2ad02b91588c3d923ff5fe82e0a SHA-1: 14cb8a68f2e3afa58b80f87e54f683a15e7fde6b SHA-256: 315ab948f38848da83fc64d88b7310b899ee0db787ab001cd163e346f880ed7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=emergency+management+of+severe+burns+course+manual
    • https://genegurumiraclehealer.com/userfiles/file/zigeb.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0e0c3c295e27aedc8bdb28a8ad2b3df/59472711245.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/82364194984.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e747b22314---bekipiruzoranuwok.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730792d9b28---bepilatubikikiturazo.pdf
    • http://piemonteforyou.it/userfiles/file/83280771292.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jkas12j9v98kp2en13hctb3mcu/satufirizibiga.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607865f59c06b---38661984732.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607606658623c---tagevoganot.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c836229e5bc31ba8278b11c02af84d54/vasogizewavuda.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/985de48e59d8a446a1ef83af37ce1345/fowobivafimoz.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3294c70d---87821611636.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bc08aa1d---29211981156.pdf
    • http://caratow.eu/userfiles/file/pexefede.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5cb81917abab7c8624496cac68715e87/mufegerifekuvu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gfgdao5f9e554vqm9adf4afkbg/36107875647.pdf
    • https://davaocarrental.com/images/file/31270812984.pdf
    • http://talleresjpg.es/img/file/40352546868.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608234e52227f---81130454250.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ed9545ec---90327551099.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64874800f---zejogunemetolupufisub.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/292acf6a7841bbce61cad406cb35d0c0/pejulomanozajijarefupe.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/mufusifojemujirusofur.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa47fbb506---baruzafasogogeloda.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b388bece3a9---65651443699.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5c4992b024ebff3dcb9be760d7bbfe1e/laxizugixokopi.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_off0000d86d.bin
a38622bea1671c4d51ddb88a67a929c77437a93aaa1bfaf0704e4846e25b998d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 10988 bytes
font_01_sfnt_off0000f207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
font_02_sfnt_off00010a19.bin
665a7e915237dcfdf672bd2e94aeac4f29b515d027e60ad9c21b75bb43a3041e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 17480 bytes

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