Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6378af94aecd8e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 23:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27b827b9386ba52b5ce9e490d4180f89 SHA-1: 6691d260f6559f3300518ecb7abe27fd1f9b1bc8 SHA-256: 4a6378af94aecd8e65d07e3c3e415503d3b6276f637fabe9f39ec5f4b128f11e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true origin of malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://stka.gr/ckfinder/userfiles/files/zinewezejum.pdf In PDF document text
    • https://daaeportrett.no/upload/file/meledekodumud.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f54c904cdd8906de6287180a20f2f199/41273259102.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e1a5dbb14fcd3c6614024e3193e78056/62227483105.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/rujarujumomat.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b48f773ab42474255e67ed14a79140ee/jigudevagisefirad.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/682bf2c4588e45126f1c65df8f11c9fe/65166554194.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/89711271833.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/70110225109.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6081540---dizesemabokezowaletoroke.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/jasifat.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/89lkf83tb0221a555lrg2n28hm/91517031035.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf1c32043---lonekamomonepet.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612a337823649---19075164873.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072808594573499.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/91986386296.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/4ce53fe76fd609a6f66bcc397e735190/23258660585.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/57255308521.pdfIn PDF document text
    • https://andrejc.si/files/file/wuluvumagasiduxit.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92434396351.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/bff0eb1885262215002c707d7a6b9403/vubof.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/vavalomaratudojefag.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce6befd8---vuwepalufumole.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/89922148155.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d3612e0---pebimupilevubopinozakupap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=foods+high+in+potassium+list+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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10788 bytes
SHA-256: f84272c30e0fa21b92f334875f6b067db76744bb239ddfe820a34e3fabb74a9d
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 18408 bytes
SHA-256: 7115ebabbf1b98adb9eeff5b3d752b13f946017c230f8a3c8d198401f65be946

Open this report in the interactive analyzer, or submit your own file for analysis.