Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf1830e87e54309…

MALICIOUS

PDF

95.5 KB Created: 2021-09-17 05:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1ecba33493875d7b7c975358ac4d6f3 SHA-1: ce07970f3542e7aaf28e8e3f2206f00a6b5fb1f7 SHA-256: fdf1830e87e54309f753a69dad20e1858aa2d67aeedbec0a5a1db2b7fceef90a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to compromised WordPress upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=auto+click+follow+instagram PDF link annotation
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df411008a9---70461239120.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3eb2958c---besojexajopuvijisena.pdfIn PDF document text
    • https://kiptep.ru/file/92392011056.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/82214296260.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/mitizine.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/momusilulifud.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/84373231871.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161408f999ad37---kokuzizunogogebefawav.pdfIn PDF document text
    • http://meta-min.com/files/ziloxifafawologatasotesaj.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zijifu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210916_71B88AFF15CCC2F6.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/8245234786.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kotofududekojinudizopizu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/24621424288.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/nonujowole.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdfIn PDF document text
    • http://skrn.cz/pic/file/14921004857.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/63713676190.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904105658.pdfIn PDF document text
    • http://esen.life/userfiles/file/rokivoreg.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d5c7b9a79a20ed1aec15c12c8b99eee7/bamego.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/lerirokew.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fikojurak.pdfIn PDF document text
    • 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_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 18444 bytes
SHA-256: 74c5ede2a6a57b0e9c9ac7a37c6483fb6ad2f98f8b53254f4da58df6288767e5
font_01_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 10808 bytes
SHA-256: 3f67adecfd31e4c5a6d332f1ceae87dc7cb89f8da2b8506475841fbdf7433a49
font_02_sfnt_off000157ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1