Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe7cac941e62ab5…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 10:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db77626fc08ba3ac655fd5f8ac6e6df SHA-1: c868301d39a62729cdc217ee57083d240c593a9b SHA-256: 8fe7cac941e62ab54d04a0bf8eddfd3383335a01e1ec05b818bbe383658e57ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crewmak.ru/uplcv?utm_term=statistics+for+the+life+sciences+solutions+manual+pdf
    • http://medicapoland.pl/uploaded/file/kagogigefoluxu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1e2c10b54262f09b04d9293ff1b564bd/26250959981.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/656c00de7e10ff1bc7941815e562ae3a/wirop.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38c798b55---78810040009.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8963fdbf44a649ba35fba58741396d6e/panesus.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0149c4937f8c8c1cc3624c4402cc19fa/lipixomijedov.pdf
    • https://ipic.vn/userfiles/file/63109189621.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f9e975e3---kigenunibaxutetekidoja.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36de10360---29378679525.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f0e3fed9---jejunoxepirisuvirag.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac55391b3f---lugadiguxodajugevodazele.pdf
    • https://feltshoe.com/userfiles/file/7905564335.pdf
    • https://heuresromantiques.com/upload/files/kukegonituvojilesizez.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8ut1qndnqmhn2g43pb684brs9d/wefinupilozuw.pdf
    • http://dentish.ru/ckfinder/userfiles/files/lubinogadojos.pdf
    • http://accessiblevehicleservices.com/userfiles/file/19478825659.pdf
    • http://pamat.ro/UserFiles/file/jogukuzujagunoxabutev.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/92035bb6d38859335d465dfe8961bbe9/40528518289.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843ca1a70f6---xoxezuvuzomiteberukawu.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a03fc12e2---sedagonajikiwul.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517fb45b0---43225429043.pdf
    • http://changrung.com/ckfinder/userfiles/files/15251976179.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607412e87b57a---zowuposef.pdf
    • https://hzautomatisering.nl/userfiles/file/44905849899.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01c.bin
4e3058f2f936f9d249edf3b17675ffc703c6461d43aa6176fff5243e93e7798e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17680 bytes
font_01_sfnt_off00011d59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
font_02_sfnt_off00013570.bin
1d6a9f2805c42a542a91d103cb586b2ce608f849794a4e570a17dc793c30b7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 11060 bytes