Malicious PDF — malware analysis report

Static analysis result for SHA-256 5075800d1619bd4e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 11:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbdb5db12e0fd76b4cf8b727bd1d5455 SHA-1: a7bde74076d1b14c0f6b25b79891eb0f1a5e8180 SHA-256: 5075800d1619bd4e30cd6959c4824666b78a6ff5752b47d3edc0c8b61b7953c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=android+weather+app+not+updating+automatically PDF link annotation
    • http://dinskayarealty.ru/media/file/98603709515.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/556190938.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/24532479467.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613099ab72d50---23048140129.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98d1ba7bc971e313c07597ba90e6af78/subon.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf98dca55---kivedalifadef.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bopiboluz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/35837845257.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311172771431.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/xoxaxosi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/bubofano.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/11120103175.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c126649bc---76494539953.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/49336670477.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/pawisusuduwaxij.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/pebulaperaxikifi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc1105bf8---makosanavofuripegaga.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tulumizeguv.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/kukavomazere.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/dovizafonaxopoxomuxa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130defeb98d5---98439635733.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/9339857932.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/widawexuxirumafe.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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 17112 bytes
SHA-256: 02e52e7e7ac6145705ed524bae4b63f751ef680d0d0fd01cbd00625ffd2f153a
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 11076 bytes
SHA-256: d0d39e89b73c11fc5e627b659a292aca5c9493a228659fb9b8fabb8ec25c07b9
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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