Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e46e188f162f8f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 14:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 243bb45c71c4d608aaf94d4f446fb09a SHA-1: 2033d758a7f2886d16153fd41f4e3d5bb4448df9 SHA-256: f6e46e188f162f8f07723b322d2f54c9147afae590e17f3f1f688f8dfa7d8848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used to distribute malicious content or phish for credentials. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

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://ecolservizinettuno.com/userfiles/files/50983445667.pdf In PDF document text
    • http://transporteslaplata.com/imagenes_web/file/zanamegagibikotaguv.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/96557057838.pdfIn PDF document text
    • https://fototipia.hu/files/files/19038757327.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/62679617146.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/zefomatinitinibeve.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/76047454008.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/32030314832.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///19873427321.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a525c649ae---4719330205.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/db1b12836c5b37425a07f26ce6ccd3bb/dumezaposobipo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b6e2a27ab8c87a0899841c7e3a8767b1/25396239776.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b97280541e24934c4aa1431edb373b88/56108520804.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1e18621c2eb02870228395eba86f55ad/fikuxinatimowet.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850a02d4c7---46862773252.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/dofodawuf.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/duvewap.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ac41648d---wusefe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb5f28967---vijojumuromileta.pdfIn PDF document text
    • http://lblussana.it/images/file/datixujukosenuxalufitoror.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xesawupijubimaduzetemufa.pdfIn PDF document text
    • https://petikdaun.com/contents/files/fapitixadezabe.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/23958ba4b67c8943144a4bd59c02f23b/16910693726.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e4a17bc---gevelujuxojafa.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zojivivewovimufud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=airport+express+manual+pdf+espa%C3%B1olPDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17304 bytes
SHA-256: 4c8052f609bf52b6bd77c750e60cc8ba0943638a63ab6c9dd31fe27426b781d4
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 11048 bytes
SHA-256: 44afa5b5526b0bdc1e21910b6a5e16b6343c71eaf8ba7bb0f171b514e660801b

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