Malicious PDF — malware analysis report

Static analysis result for SHA-256 7924b036e64ad4c1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 23:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c205ac258f5594d50b54abb251f7d870 SHA-1: b3b22bf1b8344cd5fc80e1799fe85ca466d2896c SHA-256: 7924b036e64ad4c14506571b189f53aa3de9abbd1ae4236dd06f8d2e47ac23ec
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/gagoledexog.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6fohitmlrhbqecp9tcq4ndtd75/37182148445.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/pujepapiruvuwaro.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/89869102879.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tv1f5303hji5cp4drl4k2r1j7u/17114112199.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df5d1aa5140---29908601381.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34f0f29f9---xukisifapoxuson.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/42662819823.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d22adddc2---46263591335.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3bf34f3561f93726b197997c9deb03fc/zusarow.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be4c9eb14b7---fadoxidek.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9d7abd1c---vodamatenotaxoxisoz.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/98246209749.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7e62dbcb8f7e38e8c767705ddf3baef3/67766910523.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/tefigetoxoxabizome.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/311cim0ipb468vnkg2dmniii6u/lemopumekujesum.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sagoxofajamem.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f779ba27---81274542732.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/muzegufubegusivalupuze.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6d844f658---wogugamagewopox.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7ef2ad8d0ff57185d572ab91bde02ccf/favosenewom.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/62159099498.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/34218250713.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/khg882pj8k0b5rrre5a4pvebj7/gitemefikarixugorufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=verb+to+be+grammar+explanation+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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 18340 bytes
SHA-256: e5c5c37e4a1f55765c7acb1ff313dd26071fb492eb6141dfcb0139c2f534bae2
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 10884 bytes
SHA-256: 97f1a078c53049d35c6bda8632d31e83431473f3e46bbb34c39d0791219de987