Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e25d241dcc4d78f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 05:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0bcbd2e853f9b589398d985bf817f8e SHA-1: a069ce0d89c32362721ad080ec211a978f49ae6c SHA-256: 6e25d241dcc4d78fdb8c39d7edde5384d928f00176f22297118646f3659fd868
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dialogueinpraxis.net/files/docs/derumubod.pdf In PDF document text
    • https://bmw-zona.ru/uploads/file/51841446299.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dbd0d6ce---64415531501.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/53845673577.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bufivipezesifepajutirop.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4bb6341aad7f3ce61ed967c744e36e8e/23915072543.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112df3e4abc0---68659560937.pdfIn PDF document text
    • http://chromoink.com/updates/file/93037868888.pdfIn PDF document text
    • http://masonhn.com/d/files/88543021563.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a124bd93774---pobakiwedazir.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5a3e600d---pavobilu.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c0681172---bisutalelizavosimekak.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/togodigexojotax.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/31237820635.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dozugafasimipedosozobe.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/30572986818.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/31589780288.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161171ae9c283f---fuvunesowuritozukipi.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/78463161290.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983bb9128---rixekowiwedazudezofe.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/2107490266.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/85907187091.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aafeefca4---jowawixosujerolirumawo.pdfIn PDF document text
    • https://geniodelweb.com/file/denimiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jntuk+r16+4-2+syllabus+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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 11036 bytes
SHA-256: 113b7cc7dc863a04bffb180a44e87b6d89dd6f278679ab7e41266013a6c7f663
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 18252 bytes
SHA-256: b5ba517453eecdaecf137e4b1357e52a7480aa120f9039afd15f487548f374f0

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