Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8b4e26ef58abb3…

MALICIOUS

PDF

106.8 KB Created: 2021-07-30 14:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96f70e5ec9065e45a3c9444ca71bac4c SHA-1: ca6287e4f501379a62c58f3a264eea8513c01759 SHA-256: eb8b4e26ef58abb3912ff068aea48e2bb37d65b32596fc018dec9ace179a1e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. The presence of a link farm on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100534dee5c4---fezev.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/jojusuwe.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624358751.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/532b6ff3bf64062c11da90635459a88f/96678384639.pdfIn PDF document text
    • http://lactopad.com/uploads/files/wigabukomeg.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/fanixakoku.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0derqrrsleu0omde7n1dtqh08k/wuzolezefat.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kagovuxagovunixiremukel.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4a74218---47611040233.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/77089973174.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/28uj041elr4o625llm3uuhrlq4/3632333161.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/sanodukugofevebof.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/zawuxofesegojaxuza.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/gewokunejo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tenenibekapeme.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/tolulez.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/37902603532.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/k07r54r1oh61uh2jhgbk1hri30/zubuwaxunexatewakodoz.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/fonegil.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/44430318996.pdfIn PDF document text
    • http://contactconfiance.com/files/files/40975979442.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/kavusejurobozul.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aqq9hjag1ovnma2b2q1p7ssuu7/60371074920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=respuestas+del+libro+de+matematicas+de+2+de+secundaria+conecta+masPDF 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://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_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 19052 bytes
SHA-256: 86aaa4d985da3695a3fe49e31077d424d262fc788e32a22fe49ae798197b5317
font_01_sfnt_off00016eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F1 11080 bytes
SHA-256: 756573ed5c7ccef051be0d7396f5dead19de92e476a0400d505674f503f80403