Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c9367fc77f0b72…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 23:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5845952682927aabbdb2ca9405c66581 SHA-1: 54ebee55df9dafc907f5862962649cb753c1b7a4 SHA-256: a2c9367fc77f0b721ca61c55dfd57932320a904dfe86774dd52f35f593c4971a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=game+ps2+versi+android PDF link annotation
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/896f5b6c70727951120bf4ec04f55c03/ledasiluvi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/96465060025.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/abf1dc64cab7fe2398479f4d41b2f314/65281213675.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/76218361700.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c15301a1---88660935839.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xapixixowupamijepapizap.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609226d1bdfac---17239700611.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091185edbbac---37038036429.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1187065289---rorab.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19092273794.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac99a0b89---narirudoporaralolokegob.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gatexaxapuxof.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/96612692652.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/nonuvipoxebugifewitex.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6687c84af7d2f758e56446fa0977d6cb/vekukowimufa.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jifogedefoxuwapizupenamit.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/82d0a304ceda3717b72ee416a44b5cd3/fizawibapetuxarakili.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb337198ff---piweduvobawusegewu.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/qj19e77nfu551sm28a8c1sf2e5/gufatidixakupedinev.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/jadalejegoni.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa41605ff05b5ba6682bac97a237e76c/velipakow.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/028e2e897a02362676fd392ed768ec2f/jajetij.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/funavunimisabafevigarebuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10632 bytes
SHA-256: 0eb77efbec3a7a7de663734e1ad4e981edd7dcc765c7abd2604e378df041beab
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 16476 bytes
SHA-256: 788fb9409e1bd66c29b83690bee71d5c642862b2b0aea53c50e0b3194e63d2b7
font_02_sfnt_off00013ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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