Malicious PDF — malware analysis report

Static analysis result for SHA-256 d968a384ccd8e3e2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 20:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8cbd47613d41fc0f67023d39da06ec9 SHA-1: 54ba0506c6ba02f5ed1c80405ea0b8d46224f56c SHA-256: d968a384ccd8e3e23d2379aeb7df17145c4aea0a41be9f6458ac0df5c0dec87c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=how+to+determine+sample+size+in+qualitative+research+pdf PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071394ce668e---98566787188.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ea2b1d423addd4fe11c944cded930635/99725211634.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/61721497892.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pgedcjboogemktd322ks1u6no6/sabujipojikatamobejexoja.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608f598ea305b---6801282553.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/berufizegozajumanibup.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb81caefb1d---juzuwogixifos.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/79941832320.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xogarip.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/19793748207.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/wonekoxadolotiximurokib.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/kebef.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/lepawumegidaruwigubij.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/silavufoxuvifogu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34634659282.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b422dcf1c6b---tumimemofulalekixefi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ac309cebf---supiwivigode.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zudolofaramezubesekirawux.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e860c5caaf---bunupavaginoduv.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19f0ab2c---166660425.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/13115958643.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rakujovisemijiwajekomi.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/26004363076.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f4ab30488---liniw.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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 18612 bytes
SHA-256: f66f925f95161d2d5b0c47b88aa1cbe3f26af81a5db20e33a26a3a79eb8cccb0
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 11332 bytes
SHA-256: 12d427f67dd79652ab45b7ba79f157daefcd50012acb15f10e08faf43f3ba491

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