Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c0d620706691e0…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 06:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c9aea76872ddce5eb11526aac29e7c1 SHA-1: 1aa2046603260aec6ee20de61e7959ec6dd2e207 SHA-256: f4c0d620706691e0874387352e8dd50d29cdd4a17c7c727704ff31750b6a9dba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms indicates a likely spearphishing attachment used to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=hotstar+vip+subscription+free+apk PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb50c76e15---97839037954.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb9d24f5fcf04f100677971e742ad4d6/nonupuvolusetu.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/tipodikodiwudabukedusis.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/nerosuxebur.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/49034103479.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/ropedisufi.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/72287383029.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0703089494a0ef110ab9c28a47649838/50257146386.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/vajodufedelinewagitudugi.pdfIn PDF document text
    • http://net-work.cz/data/file/masoxega.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/71885494776.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/74518486047.pdfIn PDF document text
    • https://digireg.cz/upload/lasafejilokibebe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88074361445.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/36787738704.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vugakazinibupidafazatogow.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ea20d63bfb---44259596511.pdfIn PDF document text
    • http://kachelofen-prommegger.at/46480196013.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917021515.pdfIn PDF document text
    • https://razredna-nastava.net/files/besovurubuf.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/31f05f83695ef52a409a66ea047da68c/penusodevexezare.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/defufogi.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/fojowutitawe.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_off0000bceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEB 16712 bytes
SHA-256: 8f2649c7a27a3f9c6c3faed5ce5d42f83982e017f011531aba53c783a95fb416
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10816 bytes
SHA-256: 17c9aa08f85cc2ca6eb67af22eeb40eea3221055f11948b184481cfa2be70403
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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