Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4f7e3e4dbe2091…

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 13:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6bbe8097c4b5fa1321d39aa367acb0e4 SHA-1: 0ca996f19f2c26f0d089c16083a659d664819179 SHA-256: ab4f7e3e4dbe209129f028f81d965bd2d3677045ae68c889cd6940c7e2db9113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://bptramptour.pl/files/file/66608063567.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/daaee26285f25eca826f4f2f96b2d0ed/jupinawidobidif.pdfIn PDF document text
    • http://hydrem.ru/images/file/97499344818.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/070b880be79844fee82417d4b43b793f/10041030900.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4250f276af4ff1461f06f32811183055/76476560659.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/bovalolikutodinalideni.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b573d613ecad0cf16a0b57b39a82771f/wowosiwukuraxum.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/94637008855.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/db64ec6555cf595ca7c4bf0092667c75/34158272572.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/tobumilibenurowukowuwe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112f5f7a19bd---54184037777.pdfIn PDF document text
    • https://synersys.fr/contenu/file/24006045485.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/918debaebaca0d134e07d688530710c6/83980775375.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8d254a222d697537b87d145ea9226a2e/peposawuga.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/pubezawobubudezowegowareg.pdfIn PDF document text
    • https://aspirans.com/files/file/17434698674.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659914feb7---39325586027.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/rigovazarixakafuxonowupu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fo3q1fa66ce5sur44i6u79ohgb/47367522842.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/xavafilizufipipubul.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/scuvb1e6lkhepp6n31metubd1m/71255220315.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a64c35e4---rokikokufadutovemawimudez.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pilemobaralepobapa.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/dopowipoxepenurizaguxevev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=regulaciones+aduanales+cuba+2017+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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 17372 bytes
SHA-256: 7ec631d3729656d4de62f3a7c088125ae082a1460ee12a64e2b01e6950d54e69
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 11224 bytes
SHA-256: 6fd0c2bb36f048c6c2ca7ca5c14a1c822099a95283ff5ed30fa22c4396fc04a1
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1