Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a8af05a574e081…

MALICIOUS

PDF

99.5 KB Created: 2021-07-28 04:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f08473c84c2b8a52ef5baf0d025b5a7f SHA-1: 16bc1907025703b6ebe0aa9965553bc701ad740c SHA-256: 55a8af05a574e08183214d8a6b8b9cc3336f505c031bce985d6d8c19d938ce30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of embedded URLs and the nature of the heuristics suggest it is likely a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ab372d4c---9369352168.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/41d2ac4125b6177f51fe32f69da3fec5/tazuzixiduvetafubukabix.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76b918da9---votedasaforumosak.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/dobilafozutigedusiroto.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_194510.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/bovilezoxatubiwixobo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/pemijamokolusawo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086130570bcb---14540319669.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c071b388f42---giribivofirovusixes.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bff288e7eec---nevado.pdfIn PDF document text
    • https://davaocarrental.com/images/file/diziloza.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/42656520584.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16088912b55f7c---90415756065.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/14142290950.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/veputaxarojabav.pdfIn PDF document text
    • https://khanikango.in/file/77028060698.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/40612683685.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gunatuxef.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/39c18134bb3a13c073e2bb9e17ae556b/55537849662.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947aee6c2b8---xonuvobejuku.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cacced59793---85911512998.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/letove.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/wofojolijije.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/xevawezedez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+virtual+midi+piano+keyboardPDF 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_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 11140 bytes
SHA-256: dcf0bf8bd3fb5d4dc02abee5c6f09809bfd99e52aa1097909b4df022ad733f0e
font_02_sfnt_off00014f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6A 18092 bytes
SHA-256: 3f3798724cf63757ae2cde3589d74003680cf98789e8efd8dd06937effb3e460

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