Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57145a5dc283dcd…

MALICIOUS

PDF

83.1 KB Created: 2021-07-08 05:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0bffca290a0ee31d98cc459d3e0de5b SHA-1: c01eb4c49704943c30c23be8621f818d28629e78 SHA-256: f57145a5dc283dcd0601bf30130277dd4efe6d59c2fbcfbd35bc8bb7f07a709c
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 suggests an attempt to obscure the final destination or leverage existing vulnerabilities.

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/69b253c872378c0cb1a7f61dbfa5d277/sobof.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731eb8a7dca---93144321812.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bqa2kpuh2ivft9a6gfa24esgd2/3470468723.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/27203695206.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/16755950163.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de06e121ac---31147987967.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bagopilu.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xejemuvojizorezijeruxi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd3254348---61933307580.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/mireju.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e5ddc74bf4dbdd9457cbf984014c17db/11920861585.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/93748805558.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/lisuwomujazuxiwuf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wugowise.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/edfb8ab40991b4c4b73a8cfc17d0b71c/zaxix.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/nalerolotekijagik.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2rlfeveaj4g737qukjmh6g1qtg/tavipuvikunakabax.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2156c14lid3rtfbgvveliubaq4/63906215679.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc54819c9---64203891468.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/zixop.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/felilesinamizokak.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2h1vuvqcts4sk1ig5s5nhlu8us/80939412847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=proper+latching+of+babyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 10848 bytes
SHA-256: f1677a6da164a6feaa58bafc83c4c7a17111492eb9eabdc1bb37a921cc170f87
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16788 bytes
SHA-256: aae0b8ed577231843f77ab1c3b6fcac0435dc722468075c9d96fda3fe9259393
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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