Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f54a4515ca8d969…

MALICIOUS

PDF

80.3 KB Created: 2021-07-02 02:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1610d431744449ae48f619f0d3d735d8 SHA-1: e374fe9d7915d3efb250c66060ff7ded1c05c236 SHA-256: 9f54a4515ca8d969807646517af64623dfc5dbf22a78afb71abd1b7051bd4a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using a lure related to priority mail.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608da55419588---vabupimedanosevifo.pdf In PDF document text
    • http://donauwell.at/userfiles/file/pixavilevaxiragi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5c242a75---90231777318.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832404b909a---nujexetebenunajuvovikus.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/45982674357.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/45b7885ab8c7852461388ac4e31b7d3f/jemuv.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/82473799479.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/83664956956.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/nilegifejexep.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ef16a5a5c6444ad6a86b2306466dbd2f/jolarikekekezobo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec76b96242---59250486432.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63007c3182---37938783160.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/784e4177d0f73a897d9b5511d9dc6b05/50277664288.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/kodawimafesulepanigama.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826118ccc6f---jugawafizuk.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/48969402575.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160881c00eccf9---garopimo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf75hasbfbrv0nospge2ftfs6g/58710478205.pdfIn PDF document text
    • https://kopari.hu/files/file/resivofuwumunod.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/bigomelavamipejojavokefo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc53ab0b03---pobuxoxofulowasako.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/37494579699.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/bifopuvimufujilane.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/27339873118.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/webofizozapulad.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099323bf07a4---15311199254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=is+priority+mail+insuredPDF 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 10716 bytes
SHA-256: 5591b649da5310302b518110222b3b7667d0e688c64047416dc9d636e33040ee
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16220 bytes
SHA-256: c70f70e53c7250419a1c1cf85a932462d42322c6bce161185321dde57d915c3f
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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