Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ef57c98e42a3e3…

MALICIOUS

PDF

91.1 KB Created: 2021-07-07 21:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 791cdb6da3bafeb08c7b7349387f4839 SHA-1: 2bb53cd511ab052cd55bc1d816dfd3c7e67fe6ae SHA-256: 12ef57c98e42a3e38f73ee5924884a3ea43567c3b11b13774825bf131e3c2a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation or phishing lure strategy. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://krisoc.ru/uplcv?utm_term=means+of+transport+vocabulary+pdf PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c09a1c1db---77807910554.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9538851b8---39236187629.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09e01aa3d---30941725411.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f3118230868bd9d9453e417dc903b395/xifopegujuwuxofevu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gizelamuru.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002b214c52---mabajujabuvebatu.pdfIn PDF document text
    • http://armanetti.com/images/80155174482.pdfIn PDF document text
    • https://castel.ro/userfiles/file/vomirukobutexugozavin.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6e6897291574b59ce6d51fd1f455745f/60715978906.pdfIn PDF document text
    • http://altus.pl/userfiles/file/10818949413.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/psb3pmpuh1sna3fqf14c7918p7/51134960702.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/potapidozamosilorap.pdfIn PDF document text
    • http://ekotronic.eu/files/file/pemiwutem.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vimojitesaporuj.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3ef88660---91549552432.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/7074039547.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fsa2goilabnasg7rhlsip0aef7/tigonomegizomobak.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59a46cecd---bumujotagamedimoja.pdfIn PDF document text
    • https://phr4u.com/files/tonibiwemawirifa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ec47892c---fidalojaruputurajopu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fag0mr492t6h3nfm01pjk3jseo/bipoxokodejoladajit.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/93618203262.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c8c6dcc6421405a76c3bf4dddac17b82/30067781535.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d3fe72758a33d9c338fc25bc804577c4/97010903977.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/91235370528.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/tanobufifu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 16112 bytes
SHA-256: a493cf14d42598d256b41302b6b737aafa7e6b0f151a2977567a5726682abbae
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16956 bytes
SHA-256: 9cec199e8691131949edd05f4b06a7749e188fee2df36829a703c2292e37c0bd
font_03_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 10932 bytes
SHA-256: 6e807694debffb38d8ecef1ae6d7080ed72cc6c520575ab1199549badef25f84