Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a25e1cb05f72954…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 23:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 123ea5402e88c2bbfafc67f92e5e8cf8 SHA-1: cb2e2a9cdcbd5b9060d1713d4e45011ec9807493 SHA-256: 5a25e1cb05f72954dd208ec02c8be806e1fbf849cc6401e5c10d816b23d1b573
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. 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 reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8o0hejpunvhk9v0preujdaloo1/davefojibugigipisowigobib.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a535e9940044d41227851bd0c8c7230/rujimozepo.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xugugefefugidovidazunida.pdf
    • https://eyetracking.pl/userfiles/file/vesusodulerijitegonixo.pdf
    • https://tort-art.ru/userfiles/file/57927035733.pdf
    • https://psychologgia.pl/Upload/file/11360535804.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c149ec447f8---82051499748.pdf
    • https://rimsball.com/ckfinder/userfiles/files/xavodujupenig.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7c2b4ba4742d42e43bbb27354e798eca/380824674.pdf
    • http://kojeneckezbozi.eu/userfiles/file/83113418080.pdf
    • http://domholidays.com/userfiles/file/43698272867.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a68468bd---paxozaxodudigeliwixet.pdf
    • http://czdashan.cn/uploadfile/file/2021043000205373499.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d59003d54---muwexuromaju.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858a189141---webubozotita.pdf
    • http://campfirewtx.org/userfiles/file/61952122591.pdf
    • http://jrpst.pl/userfiles/file/38513725458.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b8321f7097b31dbb307e9a2d4c6eb21f/83593096731.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c95402bfd---toruripe.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781450bf32c---nalivusudupoxineni.pdf
    • http://pierrevillers.fr/mairie_files/file/34201265143.pdf
    • http://casier-a-bouteilles.fr/file/tunowudufu.pdf
    • https://audit-advisers.com/userfiles/file/meboterusapiwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+diagramming+software
    • 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_off0000f2f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
font_01_sfnt_off00010b09.bin
4fb53884247b50ffa957342cb6bccdec8215d6d03529b692fba05b9eef73924c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 16440 bytes
font_02_sfnt_off000135ba.bin
55d1d6ad64de453926351eefd5318e29a77a0313a66b524e86fff72d81bb6c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 10792 bytes