Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0cc80692fc6867…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 07:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40535ed60ecf540cc9fce682f3f2d7e1 SHA-1: 736d2456c0481c50d48bc5d5ef41594921fee8bd SHA-256: 1a0cc80692fc6867675d11bb7615457e315a3b1b5e9dde27ece8e989564a6e7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=kindle+paperwhite+instructions+pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7777ff6c---bunekudeg.pdf
    • http://achilleferolla.it/userfiles/files/wapozawuramo.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/98593399605.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/49268700063.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qqqaq9a5295cv5lvvbsbvisifg/xenefo.pdf
    • http://buddhavehicle.com/userfiles/file/firuf.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/67423127226.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fb039e81---53851748744.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aedd7e44d4d0e8e62e17d7f5bea59945/totuganiputirew.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f8dbb131---petepikoso.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4324d98b8a---83085476403.pdf
    • http://musiclivemarsala.com/userfiles/files/40909778586.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bedad00bb41---botezikenubamopi.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ic3daik90nfuf6luqfeov0bhs0/sogux.pdf
    • http://stalmost.pl/userfiles/file/pinesibevobojetarid.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/75608515823.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d363eb074---misefiloxubiputafufovexi.pdf
    • http://maurovalleferroarchitetto.eu/userfiles/files/30654247409.pdf
    • http://topbuild.net/content/xuploadimages/file/62288054973.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b946d51d9820bc08e570f040f96f547b/75242295970.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bcngcvdokhq1nthu6u2bof8l3l/73417502574.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cafcbc10282---22140225182.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b55afa1580c26fb274ddcd81cd7780eb/80543263633.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_off0000b8b1.bin
6c6da5ab8a202889faa504ce022fd0cdd9060a3d75f1ddfeefaf13994ae31aad
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 15672 bytes
font_01_sfnt_off0000e041.bin
4b684fe925f0322585036fb74113737806c8a14577be4d3b2eff619d9190977a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10892 bytes
font_02_sfnt_off0000f96a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 16792 bytes