Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfd08c9b3e1e4bb…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 09:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d41a5ab6d30ebb310b7ee7d6cbda803d SHA-1: 1cf4eb5235044dc60791f2043aa6af5a9c0ffe91 SHA-256: 3cfd08c9b3e1e4bb0f69774ddfac1413b3edba559772d693c18866d5864335fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to phishing or malware-hosting pages. The presence of these links and the overall structure strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://parbatsamajjapan.com/img/files/files/silevetigufudolir.pdf In PDF document text
    • https://altaspin.com/calisma2/files/uploads/61013441950.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/51554688108.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/83641526258.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e4c9e01759f3ca00869df814879f83a4/ripesut.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/94195771425.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kewuvufaj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/04uha0dqr2p7v2l1hji5elhvs5/zoweberimozasa.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3637785e9877018d95754a384abc3bdc/pinefagetusupuvam.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78636ab813---76660778769.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/miwugodufurixuj.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b36c3570f---30259160282.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/nujuzekusakexaz.pdfIn PDF document text
    • http://aprt1day.ru/file/49737850287.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/rumetojebekuxetar.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161190bc038d73---gipovam.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1926a24828dfb6fc30e8aa9956c6a15a/jipitinikeniru.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4481f94a3c00fa2cf982b88d20f6c505/62861382150.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/87rhte4dvmaqqdnjfumj1dq9i7/23953334672.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/3020646185.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9051ca28a6ff69ac39e14c6b8f7b8487/30056405684.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/53803477989.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd5844360---luzenegakagexaruvilulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shipwreck+game+pdfPDF 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_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 17796 bytes
SHA-256: d9cf837c8decb8897da448e7b4ee8d23ca4aeb06baa7dbff936ace73b1ec61ac
font_01_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 10784 bytes
SHA-256: 9267b1c627f3eb97070e8b4856d4998b46e39ee0a0decbb13702a94fe095c38e
font_02_sfnt_off00014bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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