Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b47d2f67e9f24d2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 23:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de1af92f9c3cf6b0958d51102cdcf22c SHA-1: 7f03e9ee7b4c1c4d3ac2bf36d57ecf59cb659acd SHA-256: 0b47d2f67e9f24d2a765a50791ddd4f53865b80f23fd4b9f5dfd7c045496a0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate phishing or malware distribution, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=apk+battleground+mobile+india PDF link annotation
    • http://www.vako.vn/app/webroot/uploads/files/niwujemagekasu.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mijarakikenuroz.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xakanad.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/58100111910.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mexan.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acc3f67fe0---zupujukiradajevafejo.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zudegum.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/90913470123.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fezotililemisidirasavewu.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jajotidaruxanabazolekufo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb1677427---wovawejamiwivijupiwevapu.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/luwilonegofok.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/tabiwibu.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/fajewumi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/tazon.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c7b5b4cb439f0ef7313a0f5159f449e1/29759797973.pdfIn PDF document text
    • https://e-room.co/userfiles/file/49002101611.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/84078873721.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/670739452.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2035a7ae103f0282c6d6ad1a1561f975/mudozozibaxozofuxado.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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 16532 bytes
SHA-256: db3d4a541ae6553ef94b87d65c48a1b1e42cdb94c0c96aa2feeb4eb20c3adb3c
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10880 bytes
SHA-256: 54ff903c3bd4fe58b404e4e3336c3437af16a311ae818a1e510baea6c8fe32a6
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1