Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf65d9ce5f791c32…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4c6cc123365fe64cf8f7cd9a6f302f7 SHA-1: aa2e0e361c7b5b1f6e5e0c595075e0b15da90e52 SHA-256: cf65d9ce5f791c32d44f5546c294f484aee215437d56c582e1f070049c49f315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://emanuelarombiarchitetto.eu/userfiles/files/48122548742.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/44udhk6ofgmlml1lq920osr7q1/34442337497.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613819058310d---lefigurulo.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/37353658587.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/58217397567.pdfIn PDF document text
    • http://hadt.vn/upload/files/68613391339.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/55f6b61e1ff9be457bd2503c411efbe5/gotekagasap.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/wozowepagukugala.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dofavanutekowazuzit.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/vikuvulejitazet.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17395654939.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_6739EEDF7A437468.pdfIn PDF document text
    • https://webaprint.be/img/file/ratutomibenomap.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/85086916934.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/j136love2kntm1rrv2igc3jkt3/73832137772.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/dabugutemasidel.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/26400092027.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/38902683202.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/80601808680.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xutesadivediwi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/73612198578.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/10911155780.pdfIn PDF document text
    • https://etimes.mn/uploads/files/53248435225.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/zotojurowuroliz.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/zojoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sword+art+online+season+2+endingPDF 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_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 19700 bytes
SHA-256: 3d6299d87fb3ccf0d8ef03c2e67d9a812bb3de51cd67b289c2352510e4b72941
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 10704 bytes
SHA-256: f6a701367df8c43caed8c404f1d3518b163d05e26f58571acbdedbe0775c1021