Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9575a742da7e0f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0a17b4eec968f36bf1f5075d959d5e34 SHA-1: 902c348004f7e5ea2981aa6a3ad9ce62c428beb1 SHA-256: 4a9575a742da7e0f43f3ab78f347b30a8c7c3c0987d7cf8114bd44f1d69d711e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://villamishkan.com/310renonew/front/images/files/vubaxuz.pdf In PDF document text
    • http://taigesw.com/upload/files/patudurewixavazov.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9594921394a02b946e4f02cbc2916e48/mapenibenefimi.pdfIn PDF document text
    • https://stormester.no/files/file/28884436771.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/44501322700.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b8c3dac---demivekevi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614197fa6f4eb---71113532159.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/13123115339.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/jivexujinuno.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/14951504759.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/514fd6c85fe849765c9fed920793b3b9/32531214708.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/95765547233.pdfIn PDF document text
    • https://fond.ru/userfiles/file/90963569295.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6959uqblh36cvgajmft2eh6j3k/midamasomidifexubejo.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/78062623545.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/bikoriwovutiwimukos.pdfIn PDF document text
    • https://aokman-drive.com/d/files/pitokexaxi.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xirasagezobal.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/80675834480.pdfIn PDF document text
    • http://markone-tools.com/upload/files/wakol.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/39690116491.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/53c934d77810a2609d98a3658f59cda1/60172762498.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1e344cd0---91122151194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+a+potPDF 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_off0000be12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE12 16628 bytes
SHA-256: 49dc57ea31b699bcb4f3a0e2c3e4755dd90521528040d1f67193fde99de47f87
font_01_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 9920 bytes
SHA-256: c4bdd3f2e23d3e581732d6620e97bf0a13bc4a19b355913cbf572ee63c487f97