Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc282a95c88cd85…

MALICIOUS

PDF

91.4 KB Created: 2021-09-03 08:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5f0dbdddf014bd162d9df5210b169c SHA-1: 011613dfd921e89aabad7a708dc56f5925e9459c SHA-256: cdc282a95c88cd85798b0160e7df39a12979a6cac338ed98be0e09d1b3835c4d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which host PDF files. This behavior is indicative of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://kvkumariajnkvv.org/singhania/downloads/file/totujoj.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/da4df1ac5c2cb6c0aa1a66561b293c81/xurokoxigajoxif.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g2mnej2d0j1pq7f7jh9g2t3mqr/sepinotomibofedajod.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/11460290202.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/99801825731.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4645f7cc19---52148483084.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78096683497.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/pejezogapenexexokulozaroz.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/43381098200.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a6253d95---48721086125.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dotab.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8ab9aaf6527ed6708d6d25bfd3a231e1/buxekipikegisitoleba.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/60573933831.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc338865c---78256707400.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad9f13dd0---419274818.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/45218188203.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/50124670663.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054dad8808b---pobewimuvabub.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160948f5614ceb---sogetubuped.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d95a7cde---41344699210.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/69797742220.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e70b8521---rotipugagijojedovomuse.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zokamejepuvupewekesanebus.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d130b218d3---62864852676.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105102054.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/lafidifateruguwaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=course+of+french+revolution+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_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 18128 bytes
SHA-256: 4000bc7252d8f6d0ef864c7e62ab5c6de25c712791b585630fc552bf6fa24ca1
font_01_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10752 bytes
SHA-256: 40dd8bbe29b5ade53f8d95b89eab1f7be0ac6a80161532876899c0b6c3c30b6a
font_02_sfnt_off000147b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1