Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bba15dba68e3699…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 21:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 064a521e4c379e127d33c16a1eca075d SHA-1: c59039f2fd027cfd4734200324f149f897d4101d SHA-256: 8bba15dba68e3699ac254b2b5ed7af56ea1a412ce02c131cf98c0dc56c97bc80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead to phishing pages. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2450e021---lovigegewimufivatezus.pdf In PDF document text
    • https://syntellect.ru/Repository/file/18247147392.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b632370fb88---44101668579.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fakorazidorimuk.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d8216c48b1252e0b1849eb4b90e3d1b8/16412794455.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/tufodiradatefagojexitib.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50ddc7a73---kawoxajarodedo.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78558250996.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080a095cd10f---88578390972.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///baxozejujizi.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tumuvuben.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/ditivetitigabidunexe.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/relavulimupu.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/turirapelak.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/62908273463.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9d23a0357cdce4d6a1b5cff0ab853868/jadijanaximafagame.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/25onb5apjgj9uo9skp56cf4k8m/nironebomobelolis.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2793b96caf---25894526159.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac24dc137c---zasazupamokajodavolu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0bb0e54ae532b3e71b0b99a74f23420a/voxabek.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zimovawe.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210706_9D14A71A801F418A.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c857c4e4710---24641973225.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34667a025---dajulidosaxiriromulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+does+peter+answers+worksPDF link annotation
    • 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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10416 bytes
SHA-256: 38cf21f2d48ca94c1bd1a8161e88c07bd0a82712bfb16bcb749068bff1d60199
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16880 bytes
SHA-256: 2688a5e55a03fbc011c4c70aaadf0c3f0771d2fe5b6929a380149968f332eaf6