Malicious PDF — malware analysis report

Static analysis result for SHA-256 260fe3835da9c4b4…

MALICIOUS

PDF

106.0 KB Created: 2021-08-08 10:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a1b08a6f1399c2edaa297c1de1a9d5e SHA-1: b7624d15dd5c172f3f71cd54884f0ec73f08ce67 SHA-256: 260fe3835da9c4b4d80aebcc3aef419682debd2eac47e5d55ae408d2c064d8fd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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=libros+de+recetas+de+cosm%C3%A9tica+natural+pdf+gratis PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/suj9nqic40j0js0gofrgnks3gq/fasapejezal.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2035956a---rulibu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/e56ugqsh60j6mns4cp1stig2hd/16084930041.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/17cf0fdc381493525fc32720307d0cf2/lujes.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5beaa7dc0b28c5d4d9e149811a863910/3486128402.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/larakevuzevokedidimu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/zuruvulagevi.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jawaweborifas.pdfIn PDF document text
    • http://93564497.com/userfiles/vuvug.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/7482855871.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/39734799318.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/danexudapisagol.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e25a51ab3d884d3019cb3d97daa87fdf/rujejeworugenorej.pdfIn PDF document text
    • https://autoskola-scp.com/files/giwekuxa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7cd6f0f1---83414591226.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ca74d002---60099399651.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/54533861798.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/bc4d1108dbbd7b43c36c78f24d368b0e/suxusiburumilifunebodesak.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/donumefigetekexip.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/zififav.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ss63qtmdgvra90dfnp3c3okrat/sopefejigumile.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 11312 bytes
SHA-256: 30c063e7bdc0da154efd79cca3508dae13b28bb8264d823e358ae24fa50537ba
font_01_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 19336 bytes
SHA-256: 1c1bf65b1fc461ac8c19bd41d87b779193d5aefe375bdab55ef9a967c953bb98
font_02_sfnt_off000175a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A1 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00017dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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