Malicious PDF — malware analysis report

Static analysis result for SHA-256 44de171cb52bf191…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 11:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 507e7138977979e3d64dbcf38b3ec7aa SHA-1: 47735b548b7eb28a94e03e46174f5d45f6eab7a1 SHA-256: 44de171cb52bf191917496bf30f631bac39621c5d0b679f2e1100a931ba3fafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=download+nova+video+downloader PDF link annotation
    • https://auditorescr.com/ckfinder/userfiles/files/94695575769.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/rosag.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/10672879514.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138cecd3ad28---38924201551.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411c3357560---gexaniwatekizisabid.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_EF4D02827346F4B9.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/57420435225.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/16623631398.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lajaxabosev.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613214fe78d3c---68406343057.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33256870047.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/36717416679.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/80097359244.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/65294651310.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/pifuje.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/98874556138.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vozokenesesevoneg.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/lomimu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d41d35879e79aa7b445b6d4b6ecad2e4/kolefozem.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zenulafubegez.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/92613672263.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/44702091689.pdfIn PDF document text
    • http://4bx.pl/public/file/32304152533.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fumiguzotokemupapofepe.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/80514992387.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 18076 bytes
SHA-256: 08ce3ee92bf32aec0fa802a96113b54fbfab60f5b78971c64373fd861d89a273
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10128 bytes
SHA-256: 5ea25c438109e6c328d81f79c4a775e889cc5ae185b205dab0c91fc0e4107fdc
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1