Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cde1589a04403a6…

MALICIOUS

PDF

80.4 KB Created: 2021-07-15 19:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7edfd0b4d393690b566f26ffcb2daa45 SHA-1: fc539d55472b3c4fadf946662d3b4b60f1505366 SHA-256: 5cde1589a04403a6d9e3b004fd74fa42565aaaa3f1340a66133f6868e21704e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/60b4dc23ed7465270a5d84a58f25b74f/61695951380.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4a78f389c1ffa2466bc8e472bd48eaf8/85252449147.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c0612a7a---setidozazet.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/6039881698.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b213c8d1---xexufog.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vteo974bfuti657j3di0j2vlr2/29891563213.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/13622575811.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fd97168cf---24809134641.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rqu0obg76q8ne4ptq3e6f84rh2/paxom.pdf
    • http://criollo-cocoa.com/userfiles/file/14919393255.pdf
    • https://bandai-k.com/userfiles/file/24809833602.pdf
    • https://rmp-traueranzeigen.de/cms/files/98955856815.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6945e6134---54915961471.pdf
    • http://wildpflanzen-planung.de/file/21012145719.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/jovimerulovorariwepesite.pdf
    • http://marketypik.pl/zdjecia/fck/file/kipawisumipanumariw.pdf
    • https://laurallo.com/ckfinder/userfiles/files/12074103991.pdf
    • https://blugarden.eu/file/puwivukelosezap.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073941eacea1---semegiferutal.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ca465647---gudunozipodixururezagojit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pastor+charles+jenkins+awesome
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607028d7a25e5---xogidodenuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4db.bin
36fe1176ce4e20addb268722eb45847e9fcd00dc386a3eec98d6e663d0612f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 17628 bytes
font_01_sfnt_off000103a6.bin
b7b4adfe546afea44bb5158bf6bf0e630a9386f4ab53066ba2bae21063b496d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10804 bytes
font_02_sfnt_off00011c6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16792 bytes