Malicious PDF — malware analysis report

Static analysis result for SHA-256 395a5620d7bcca4c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64a6070b36d4a2e711e67bf9b3a970a0 SHA-1: 485dbe5a6e3c745ec5cb0d2bcd855bb99efd8142 SHA-256: 395a5620d7bcca4c5b5ecd2eb038f83c7ba2541f96adfccd37b41e26e9d7c26d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on various websites, many of which are flagged as unknown or potentially compromised. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO poisoning campaigns. The presence of multiple links to external PDFs suggests an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1deaf3ad3d87e4ba3de023f985aeb050/junosusuvenajaru.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/36016480560.pdfIn PDF document text
    • http://bulmarconsult.com/files/leduxixitawabewif.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/74052810597.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wirufokonelejub.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/26027153236.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/74809973413.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708f007c8b---15143515028.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/19905025923.pdfIn PDF document text
    • https://beaszemin.com/files/74222216212.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/94360335717.pdfIn PDF document text
    • http://orderkai.com/uploads/files/87630971669.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xatutobureni.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/51168903113.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/4167982423.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/gajadunojatubalobi.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/gitilopatidu.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909083217.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/26560083009.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/39969213269.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/sozetujof.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/99895254119.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2cf8680a---23258501694.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gezetinunesebofosigifug.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/xamujubedimusumo.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/88852696222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=detroit+lions+wallpaper+androidPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10472 bytes
SHA-256: ac336241476a0bcbe4f28b93c8d302148508386ccb277805fcb17cf4d86cc0c3
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 17576 bytes
SHA-256: 3948cfe023fb75c40ac099d4085a04b011e6d1f9d0ce603a200576a946a0d757
font_02_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1