Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d5fb03dc73e3dc…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 23:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fef4932f63a8da8796d785ee4b048fb4 SHA-1: e3c49edf7b3319583d70c9b4aea73c9e5db747b7 SHA-256: 68d5fb03dc73e3dccb3bafb2f76847d996bea9927255a3646c5c5cfce6999eeb
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host further malicious content or phishing pages. The presence of multiple distinct hosts and the use of form-builder plugins for file uploads suggest an attempt to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814aa1f34cf---bewaroxufijuk.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vl2a1oih0rt0i0f4cpn3kbp5o0/sofufuf.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6153700e4e---50480849034.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/351183ef65febd13dc35f8e8eaf12bfc/61948506787.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/52320802988.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078a63924abd---50332296855.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd021f5e---wijiwuzedawidado.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9cb8a31d---13037407502.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a0d6783b3fe92ec29aefbb03c2f9f440/pataxexafewe.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021616523409.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2763267d---bomizudimipaledevagerapo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06e94b845---7576927583.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pibitov.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/xikazofusesabejin.pdfIn PDF document text
    • https://turbooto.vn/upload/files/28031779171.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/daaae259a75e5e10773f4b28587fbd7a/xuwonedinijisibonuvi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1342ded0e---suwobujatoropovut.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ce5df69a---96439269360.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096415d3a228---tuboj.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/37098723240.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makosetupajesuko.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/jiguku.pdfIn PDF document text
    • http://envigest.cz/upload/file/venitepuwofalumeboresuno.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a0b2a02c---7497587925.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/54708285332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+viewer+for+windows+10PDF 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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 18112 bytes
SHA-256: 841c82a28aa9133a3b24a5235d7032167752f98f98b48d3d811d17e97aa553d7
font_01_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 10584 bytes
SHA-256: f00fe6cf2ab94833540b1d23b0245f8a1063037a09467829a5d4aad16eaa73d5
font_02_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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