Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f4f598787bffa6…

MALICIOUS

PDF

106.7 KB Created: 2021-07-24 01:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bd3f95def465d261bf2e24ca5cac8d6 SHA-1: a20d300f796951f5119796400ff6ea771f29b6b6 SHA-256: c7f4f598787bffa6b7c0b3f8af8db0d15aa58d3148fead5a1b63275d83e2f69a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting vulnerabilities or delivering a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608146fd7ef9b---73266803632.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919b799345---bogumefepudavukozujavodof.pdf
    • http://talleresjpg.es/img/file/sawaromegix.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a55389d5---31012855398.pdf
    • https://purmoradiatoriai.lt/images/files/66338103382.pdf
    • https://ceccargiurgiu.ro/userfiles/file/80173305943.pdf
    • https://soudurelauziere.com/upload/editor/file/nidil.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1f4597e75a774a2f01d9eb64cdc2121d/67463274274.pdf
    • http://shiraz.sk/ckfinder/userfiles/files/tozekedetex.pdf
    • http://signauction.net/userfiles/file/lokovetexaluvo.pdf
    • https://coffeetuanvang.com/Images_upload/files/nobeg.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902a267ab26---tewekibawejenagus.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/80972192738.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccf1b1aae---93536371873.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/63c9c6974e263dedbf1ea9468fa84bb2/misupaxokewawasojudug.pdf
    • http://bronia.org/userfiles/file/74338001396.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d379b9ef---57503144934.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8edbb6e7---81623036595.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d261839055ff5513d223c3f07b1ee1fd/badeg.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/vokazibexipawelewuriko.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/wupelagofuxafotetasul.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8bdgu836kb76jligr4bt4f2eud/99301839817.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d774efd9---43592569789.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+update+my+bushnell+neo
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013065.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 16792 bytes
font_01_sfnt_off00014872.bin
478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14872 1760 bytes
font_02_sfnt_off000150c9.bin
4a5e11be45556cbfa4f58f8b260ce1e13bb052a0174223ccbd69c59c037d8d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150C9 19120 bytes
font_03_sfnt_off00018353.bin
8ff5e7d1525159f63eb6ede3a8034f0d6caed2981071865e0c145547890ee591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18353 10988 bytes

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