Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f808ed491e8ffda…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 09:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bda22fb3eb17a47489e8625ea4cdd273 SHA-1: a5c9122fd8373cf4372eeaa7bf9beae1d3598207 SHA-256: 9f808ed491e8ffda3a69bae6695ab563bac3291cdf97dfc3a51cd0cdb89a56a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains. The embedded JavaScript likely facilitates the redirection or further malicious activity. The primary attack pattern observed is the use of a link farm to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/16af4872ffc22a9194a1c4e1c637532a/lexijufelaxogej.pdf In PDF document text
    • http://khacvietlaser.vn/public/images_news/files/wipogug.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/idru3sspf54mk87fnd211erhga/watedejenipufil.pdfIn PDF document text
    • https://angkagenap.com/contents//files/podoxisidepivowulabisarez.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6c640355---1929411451.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/16125032806.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/50455856091.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9daf7c3b9e18486ae1a6454cb6072568/zafojogotonajom.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/68254475600.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924ef19b30---84570380266.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/k61tfg415h28j20pmhha53j0ug/nedidulofapazabebug.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v86rg5g5cncpt0bv58iedtp7h5/60224438866.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57439282803.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/61a8cede96f40f8a62cc5c01e923f370/nunorowademiruwa.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/3720892716.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/14216f5c1aeafcc8894387dd8ab20b2d/22411955740.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/telefijoni.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6dda1c2d52d24542a6caecd8689dc9d4/87609302928.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2b205f9f773f2bf436edd6709d273e78/feguna.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/7966215381.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/881b5c12b1202e3515c1a571ef356aec/280652539.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/958ded1aa9d35b819d626f3f8eff7ff3/subazirexotavoped.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/40732108308.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/mufejurezuf.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/linujikojif.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4f4797a0---67721784344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kidney+worksheet+questionsPDF 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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 10664 bytes
SHA-256: 1ea34ad6be51aa08c83697a87e24714eeb10132ca6537dac8eef4cc419fd0d9b
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 17416 bytes
SHA-256: a245bce153cb87c9e05eb273dc2ca714980d7669b898e0101313914d494b41cd
font_02_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1