Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ad566502058902…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 22:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 430fec44b856bcef30418257d28c709d SHA-1: 2e42fa21a8f09a99c63e90d989eb6ca3383957e1 SHA-256: 13ad56650205890287a4c790655c049d53755a6117d1550b3ee5328984984cef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://iccjsc.vn/images/uploads/files/78807381083.pdf In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kadas.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/morolapikafa.pdfIn PDF document text
    • https://ferropula.hr/files/34153468573.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/fezurutonimewuwudux.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4qjnr9egc18l0q11qfqlq79l80/fubidarexepekagonemeb.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/basenakasanojodixutadub.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/33612064552.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f26e9e687d446e729459482a44b84ce2/pinaxik.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/mukesuke.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/18733629797.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/24620695903.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/arpj2p2ktc7fcb03p91pb1pv95/99468280559.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81615846541.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee8c8d5f9---duxusu.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/vuremabegu.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/32541605657.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t3skt58bnl8u5u4t742un6sbg1/bedepowelujakipojiregigaw.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46773662041.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/bubatitafubidadudejos.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/baliwubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=halo+the+flood+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_off0000b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 10124 bytes
SHA-256: 3ace6e0d6b8456578457fc457392a8d8db0095f6304f80eacf22f724479c4362
font_01_sfnt_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 15464 bytes
SHA-256: 2ce3d1e49d0b0ba15aca5bb301190d0a98ec5344b09ab41822bcfe1bc1c264a5
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1