Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd3a45db2b3c6f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 20:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0343052b083e230a35f51458a7ef1022 SHA-1: 782be4483e1911b6f190434f1e688d398307c522 SHA-256: 2bfd3a45db2b3c6f5056b5918ca3365e7889a826edf189941f10149e2ac5a2cf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://faptvmedia.com/userfiles/file/40887735141.pdf In PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pakesipujotapik.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/selugedisozesetulogowed.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/bogus.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/xajedazuset.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/piraxuma.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/94851940439.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/25462736540.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/xozunimonefegosokisebem.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/fizudukuletegob.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a65758b057d7258a99f49d0b248554de/veluparapanotusokojusobob.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tibafe.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/4045111673.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/susuxefomitogojiniduta.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/90665489603.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/dutoxuzekedoz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070e7822f---basumibifa.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/32895297804.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5c591d4f708f6e905d9dc8ca9b69b5f0/2967939131.pdfIn PDF document text
    • https://funke.be/data/file/625622470.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gijobejupa.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/71854712266.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/5030920222.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109032225495351.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210912135403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+for+sprintPDF 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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10500 bytes
SHA-256: 5d12857b1349f1e11ecd6e6e178f0b51ccfe4af8f536da0a8b6f7eab466865e3
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16720 bytes
SHA-256: 288ed2bb4e8e45434cbc9b04f245a6df574f43c5c523f0e8af128424fb5ea4e0
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1