Malicious PDF — malware analysis report

Static analysis result for SHA-256 c641d1a9431cc5bd…

MALICIOUS

PDF

130.4 KB Created: 2021-08-29 20:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 256bed6b0f29de9ca6f02aee04b3f0ce SHA-1: a144e1702c8e64ffe377072d6772804b7ef8139d SHA-256: c641d1a9431cc5bd756cde15d5ff8051fceef508ac95dfe3daa0566b21d786f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links form a link farm, a common technique to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc9315c24---vejipuse.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5354607ccf---19119500991.pdfIn PDF document text
    • https://dintek.eu/uploads/file/8532273872.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/bewofogagexazedipasuriwik.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/13396428192.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/25ec36f46c390b20e7e5bab2c315b0f1/55354642909.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/7063809267.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c16ba4ce---ganuwotezike.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/wikumafidusezowisuwivax.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/modedeluv.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b2746d92---foremotatirinubijemaxig.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62a43532---52312485544.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/85822050151.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/30472597338.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/51057297375.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e00d7e0d98307c6141f4903e7c7ec407/kijikofumij.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zedonezamudasabawabanata.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853721e5e3---51388950180.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/kubizegapiv.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffbc9b43d---diwaseb.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b3fd0a7b8---47733533612.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/lupezefiparesatenuteweled.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/41dad3b2b0ef45fb331e1b30b2c25b77/sogizugujisiwovusisufenel.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jizedetowenuvaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+legs+did+sauropods+such+as+brachiosaurus+move+onPDF 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_off0001912c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1912C 21476 bytes
SHA-256: ee271437bf03d8c75c357b5d81a6b250c29860bc74a4ae3e70f17ad2538e3cb8
font_01_sfnt_off0001c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E075 11360 bytes
SHA-256: c5eb0f6fcf26f63c67e300c1222130c6cf4930c8e39b383a3102862afef734d5