Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9101baee452e35…

MALICIOUS

PDF

102.3 KB Created: 2021-06-30 13:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9fbd5ec6afe1b1b9437b2f988bbaedb SHA-1: 93c6be6ddcec4b375a1e87263ac19b47616c46f8 SHA-256: bf9101baee452e351a750055e21dc7b9eb11249876e980d55a86ab44cc767302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to these external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=paper+towns+free+book PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/860cba1cbefffd613c75dd91496b229e/97275299905.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mgpqirmmr8utqln2j7a51v0b5l/loloki.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f2868278---58995562552.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111aa9a53f---makoputonejutazi.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/dejusuvanatizufakabagi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089988ef092a---kegududopupivezojogo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/9555758099.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e7d4175c9cc42ffd177ce9c2236b4862/xatemitobapofaxup.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/43375734288.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c8c86029e---mixajonu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed8ae0dd2---59651446780.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f20b7aac---kogigazudomulozibolopo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7b53636799642c1f57a71765c0c16cb5/xojuraluminefamu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608123b95f252---duwitagenatogojuveji.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jalufefidanisafodumipesa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ca7nt8dl2d9s9pdsotaotuj3jl/926057406.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607588f6ce702---92706557662.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb8926473---xuganixokagebelowewijuv.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/jilirobibebam.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/53660b1c4b6f9d37799c63b70e59b22d/rudasi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084785431b5c---60930580891.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29c90f853---36517773337.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4ql72ddnikftsvoperuiek8ocl/sidekewe.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051512261273499.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a92049d8185a8ff2d6e7e7c9b1186147/jinulezefezarafewotuz.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_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 17028 bytes
SHA-256: b8ac0de614abc78539cf5f19603c73e436d0fed2bfc2b3c8b056c6c901bbc340
font_01_sfnt_off00015c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001742c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1742C 10532 bytes
SHA-256: d6f4e39379dbaf38435d14cb747747baf3d1a1a2e1d684b46589adffac279d47

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