Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe31e3deb8b26d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 51c6fbd18adbee8a10ff36b899bab85b SHA-1: ac990d61118ec74c771569a732359f834a29994d SHA-256: fffe31e3deb8b26de3c45f359ae4276d040692822c51500476e985270e3e2b35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing embedded JavaScript. It also functions as a link farm, directing users to multiple potentially compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/7468ae42336375fc5fd9578cdff2f2cb/34165089963.pdf In PDF document text
    • https://sindonis.com/userfiles/file/fatenufazuf.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a318ff7cb49f6e761fcbaa7fb663283b/58509956066.pdfIn PDF document text
    • https://andhimazhai.com/images/files/85416776073.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/76150e736b48e93e7d592e37a85cec51/44506134531.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86f1b0877---46806324788.pdfIn PDF document text
    • https://area5srl.it/file/wobavudikobe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b93c09444c582ae9f115ca23f5d71034/33445070517.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/58762094544.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9be68113---guvidubas.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xifol.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0ae1cd0549ff178c27cb5196a5f5d8cd/posijobovebafufazizop.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/73134433707.pdfIn PDF document text
    • http://954move.com/clients/4890/File/70867188812.pdfIn PDF document text
    • https://dineflon.com//files/xirumomazo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/r63mglotbri8g8i8rhhlvg32u8/fenutuvodaxim.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v1q1k3uc4tfjr565vt63arf32p/tenodazujomisa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9b786f465b6495f9487074e9e25cb138/tapemesutigugufowaner.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/12729468305.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/12cvkg1o3lh04d9qirh0fdnl6t/57281663502.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bcbe19c27f5f15c46ae753aa22dc68b9/9565999440.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa09d388e---juluwemukejunep.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/suvexilumakokolatilus.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c383c822b9d79115e52ed8520945e666/55224950916.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/nerovugatawuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=xcom+enemy+within+android+apkPDF 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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10864 bytes
SHA-256: 6e9d2231d8a9b2248c06e3c62ae1c7aa3d8132e353c0845ae8c011d2fe39c399
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 22976 bytes
SHA-256: 7a78628043327db8eb2de65ff2672442ebed32bf981b4ba295a6d61a663e49b4
font_02_sfnt_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1