Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d79abe76fc061c7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 13:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77d6d288f8af84f50f1d18d997bed935 SHA-1: 95bbbce2c7b76e0baa254c94b94056b11ea7e7f4 SHA-256: 4d79abe76fc061c7fd4630ff799dae36ce0399106a43552e3a28233389b08163
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://acgroupenterprise.com/userfiles/file/voxajibotumiwanipowudi.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/66223341647.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8535f2c6f---solitekurov.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/87436781923.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soluxozigenezogiza.pdfIn PDF document text
    • https://grancom.by/upload/docs/madewimadorovokupoz.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/13538683219.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/50sj70128ruvt7akl3hvbvc1g1/79964140764.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad168884c---noxirezepodaxadis.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kodasituretelori.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/88486404226.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c661f1ec1---56552082321.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/rotokumegax.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c6675593---xolosizukabewuw.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/91240884648.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/o883d7grsmf2jovclpq4qn2jk7/42387853194.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gadixazozepagudijufedu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8b86b797d85fd7067c2d0717551fcef8/jopejaforeb.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4nhcme9pdbqgf6c0irrejn1no9/95083776945.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/44714729623.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t7dk6s902ldbqduuii5v05f9qa/2798128236.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c57e9619a---39604648364.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/12045809709.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e44e8423e2---70811468027.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121601b0c6ab---2722218837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pragmatismo+y+politica+rorty+pdfPDF 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_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 17552 bytes
SHA-256: 7974acc74172ca4b237f2e16021d41ee4cb7bb584ac979e6e0144bd21a16dce5
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10840 bytes
SHA-256: db27de69245f1d839fc6d4a7906fd08c58c9b8de1721e23738484706ea964a2f
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1