Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ce7b183e3ab1b4…

MALICIOUS

PDF

99.9 KB Created: 2021-09-05 23:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9601ea2c4702b5a35f20b469e64bff78 SHA-1: 0f2a37cb0bccb517f0cda9ad2750869ba21c4a3d SHA-256: 20ce7b183e3ab1b4e02f990e047649f4e53967b2d6ac62328f03becff104c7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5485d6da26---rijolofipoba.pdf In PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/5270406593.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/rt6k4m255sdaa3fcj0t40060v6/32841351833.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/kb6ts8t0h0vc1oig9s81n7sh30/zolugopi.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/lolisuzufewalipaneriki.pdfIn PDF document text
    • http://elpijisystem.com/file/14047568264.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/24a393c32ab45b04fb7971998cd053f6/68672140805.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/95951313913.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/voperelororomobikijubup.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t5carjtgp7escviv8o6a9b0v4c/96747062714.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c3fe105feea252e4fc05e2165937e5ef/75273689298.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4565509804ae49cfdb42fa33e4178c4d/97643793442.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/dumamogiro.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611dacb5006fd---45281114021.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760cb631eec---72316604349.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/89146742710.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faffbfabcf0---majuxen.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/sebipobenunogixajituwunuk.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/92998204914.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082f7acf2d---lavewogodeliki.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5a79f80b---kanuzalowamutumex.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/xiwenuma.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d3i1a12e6lfltv9j7srqdg16ng/21245621094.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/fukowonojinebejuxepo.pdfIn PDF document text
    • http://mrybalko.ru/files/17658194119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=biography+sample+paper+pdfPDF 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_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 18264 bytes
SHA-256: d7ab6d2f6fe52f04676b47a01db3f5a5cf3db4be7585179b8d9663996484b9aa
font_02_sfnt_off00016906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16906 10908 bytes
SHA-256: bfbcae1e724a8ff9827ddeec102dd9edc4a5aaccb5b11019f99bdc526666e1e2