Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c7193d6985d36d…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 10:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df9128c1c195d0a4ff816bc2247ffabb SHA-1: b7ca59aa563c428cad10d08ca36aba991c025b1a SHA-256: 26c7193d6985d36d76e5d1bb8d7c61061afa2cdd4e94305fa9e12840765b09cb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure malicious intent. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may attempt to trick users into revealing sensitive information. ClamAV detection and ML classification strongly suggest maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crewmak.ru/uplcv?utm_term=best+pdf+editor+for+mac+review PDF link annotation
    • http://apcmagon.com/userfiles/fewelisovurugumatuxoxin.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/jiwolozoxubibud.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/59185145001.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/85890327692.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kqbjoa593fi7s25n1of6099rd7/15623613091.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/bekorexokutomuba.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bixawuvazaxutujabuw.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/lugemurevuri.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5311788f7b325dd123cba2972e8dfab/48490287140.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bipenaladijizironiba.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf10be086---rujaz.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722624c6b79---27330635755.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a2dd125ff60e47d8204c9bc3f8b55de9/sukejufa.pdfIn PDF document text
    • http://tavio.su/files/file/jexokigesifexopopakamur.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jabekunogakibokudut.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a257f2b2fac---lujekogejozed.pdfIn PDF document text
    • http://etnorom.hu/pictures/goxodoredujalurofi.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/kodasekinus.pdfIn PDF document text
    • http://carbonelite.ru/file/94103372141.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/24134854291.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160caba5c8d264---panujitiwop.pdfIn PDF document text
    • https://j26clean.com/upload/files/36324394705.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3498dde7---rakunizijijap.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/57251f86bfec639cf33b90160a1da956/81593907547.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_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10836 bytes
SHA-256: 19fa6a775bd4c332f22cf48ec0788110ac6a314db8481f2fcf283b7bf906bbee
font_01_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 18580 bytes
SHA-256: 066c47b2c10a75490ee4ffe7d7f4e8c004edfcfabe927db611acaa0d03b5ea5a

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