Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ff5f7702834175…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 01:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb651d53e1c8515db48493926377b66 SHA-1: ffed022c1cac68488dbe9dd4122d1ae44ff374ea SHA-256: d0ff5f7702834175e0e70a3ba5ff2b0bb2d107ede48efc81b2ac6974a9fb16b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0c1cf1298053df3c36cc9c51e4942e5b/97490381026.pdf
    • http://armanetti.com/images/28593688975.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/gofasanawutuvogumamusifir.pdf
    • http://tlxzkj.com/uploads/file/120506135282.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210621_EB9934E1E6F2FB8E.pdf
    • http://aquatherm-graz.at/files/kezuremoxifojexozub.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107594bf3b---rowomu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/73038fc7122c5409a30fdd4ff51afdd9/17527404896.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c707eadea---20808451880.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9b983371---75634624775.pdf
    • http://xiaohecollege.com/d/files/wupiwawoloxamedegewazeka.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3b4292852---zopafusotusivejeto.pdf
    • http://files.ibiza-ferien.de/file/21679353661.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab135abc---76776294890.pdf
    • http://alibabashipping.com/userfiles/file/69483046658.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/cbb6926471e2a96f7ce0eb4aeeb5ffff/9501540937.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7e5c0d48---bakilajak.pdf
    • https://zegabilisim.com/calisma2/files/uploads/dowaladesu.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7b850c44667f84f0003f2d6184e01ed8/63444832252.pdf
    • https://marosme.ro/hirek/file/43074640664.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dbf0b8841522887101f676adb4a62667/laxodorujuror.pdf
    • https://hzautomatisering.nl/userfiles/file/16883363670.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e546327a1a---vivopaguzoxasumumi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=etching+and+drypoint
    • 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_off0000f213.bin
9e8a52113dcc315aa80a340f2edda442f20e014c5ffad9a0d334716d8b58065e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10544 bytes
font_01_sfnt_off000109d0.bin
488842b8fe450bbf9477d9828c5d8543237f384a0a5dd14d17bb3750f233fc78
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 17160 bytes
font_02_sfnt_off00013612.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 16792 bytes