Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37cf5ea550c9ada…

MALICIOUS

PDF

84.8 KB Created: 2021-08-09 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a177442f6c198717201adfd1f5a9fc2a SHA-1: 5b4ab6379a7a48af2c36c837175d17a2ecd78112 SHA-256: d37cf5ea550c9ada52986f9d5f2233a4a9076d1eb606b5d2a53eff53725886e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, specifically leveraging WordPress upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0927d211a9---dugamiwelikemasilovomomos.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f40e8119a---3884539523.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/lagomusoz.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f4927d63834cb1f9950ad53366d123bb/xawimumivazezerej.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/50829131277.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d615d707a---94721465920.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/67fa5c0df030d840ed33101679802692/rajuxegalubevugonolevifom.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/larotukowaxumo.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/kakafunetanukesepinom.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c70752d4---9891792458.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eae02a0e---kifatu.pdfIn PDF document text
    • http://cmtsport.com/pliki/vuvuxinisizosew.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1d41a4d0a---29676573512.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/bexebowuvabupaf.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb4c83fc9---dotobiboditotepi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lobasgglgpnpr3b3v993qgve6p/belipowugakerax.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/49858725227.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/masinipaguxutadafal.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/zodododazevaje.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/99369178872.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/96950015585.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xumokusotaxewepasanedi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kelofedivusujepa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/aa3877173f63e3028bb8beebc2ae0edf/gidovakifokir.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/86b6ec15e8e469d9196b340567df037a/vulokugusef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=super+mario+64+fortnite+rom+hack+downloadsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 11484 bytes
SHA-256: f06f0d8b80979ed75fbc0c40a0836c08bf44987b51c0ea49139570536fc1eb93
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_03_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16492 bytes
SHA-256: d317b26a2279cdc7df3871ae8934144b99a64456f0adaafdf06d75d05129de41

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