Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d32780b393cb25…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 13:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51d713d01ea0cc2c4294b08f6bccdd22 SHA-1: 6aa0474dd18450ee7d0b26096883d1a8ec2a8863 SHA-256: 26d32780b393cb25b197b3ffbf7fd92df2a2412b2c8433ef0e9bc45e5ce70279
126 Risk Score

Malware Insights

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

The file is detected as malicious by ClamAV with a phishing and trojan signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3549

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=critical+ops+radar+hack+ios PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f7d45a2a---levezadani.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfe3fdeb---topos.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/varik.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a891bd0a---31387662696.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/zexafodud.pdfIn PDF document text
    • https://birudongker.com/contents/files/99781744800.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78097805241.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161460e9a4a51b---muwikoweb.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/14875082759.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/simugofi.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/62956502987.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43992008100.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/tivabijumodawanav.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea557d89---venutiga.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/57849763300.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/veredolekotenisig.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/xarifoluvexofizimigu.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/9645893390.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/55552685233.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/machihbncg35h0njacrovp40lu/xeberoxokenemumaju.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/31833528103.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/74209533986.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8abd32f9c---zovabujuvifizugimigikog.pdfIn 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_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 10496 bytes
SHA-256: 3a1c016cd5ef533e97912d9669902a221851ddea72ef763647ffe54735ae74c6
font_01_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 20368 bytes
SHA-256: efbf50bc990d7e687f3d73634cc0091fab22f80c2158d36d27ef7008c23114b4
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1