Malicious PDF — malware analysis report

Static analysis result for SHA-256 d098fc4b0fd36728…

MALICIOUS

PDF

97.5 KB Created: 2021-09-05 22:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8040bd08578e8c9ebd19a4eec461156a SHA-1: 3e749f75fa7e9383dcc477938b0159c71605cfb5 SHA-256: d098fc4b0fd36728ebf45bdff2d781cebdd49218a033fcaf7eec7a0d6e0ff087
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://cructi.ru/uplcv?utm_term=the+importance+of+being+earnest+critical+analysis+pdf PDF link annotation
    • http://villahetzwartepaard.nl/survey/userfiles/files/pemavevogejuwe.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/3276605942.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/rogubidapifixexodafozowak.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1d4e9f73808534fcb8732d714a565176/tibipoxeposonas.pdfIn PDF document text
    • http://poorclarescork.ie/images/41951203033.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210608112409.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cfa95522ce391fd34229ba21b860e321/13801619582.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/suwenafaradajero.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af34bf0bf57---63274420706.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd24ae50d0---91274394438.pdfIn PDF document text
    • https://airshow-bg.com/file/ranegazeguxikukov.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/59290980688.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d135552b0c---48796864360.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc452c262d---nedobexepit.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jithgj54q7poi515lr10m1jbr2/dibudafufukadumakaza.pdfIn PDF document text
    • http://headrepublic.pl/images/files/87311691109.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4185abdd3f---1253124878.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d17j5gvm45kusggu5n2tc1olva/meletaminufatobikifojena.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab8796bb0---botiruxovebimibimov.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kitavazafanone.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d9fcf4674105f68c2bb25b5ec682d1b7/nexukig.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707960a738c---tivadokutexipozebogekex.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d40d499dcbe433fedf7b4d2596bbad92/wuduxilu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f8n92aqbp1v6ti7upkh1nqr6e0/90997384983.pdfIn PDF document text
    • https://kaimano.it/file/judeperilesexaxub.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_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 11284 bytes
SHA-256: 15a054101ad611096114e8f259cdcaa2dfe0b0325b7be76b09b3c8b70d7c235d
font_01_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 18112 bytes
SHA-256: bc73030797665df0bc96a360e139fa692d8ed62535ed3023dc2dd02132a1056b
font_02_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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