Malicious PDF — malware analysis report

Static analysis result for SHA-256 db79f9b71153f4f6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 00:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b651999826ab88fe68de4205bf033f1f SHA-1: 38309e9b025151b16bfaaebb8705b96bf5d25d1c SHA-256: db79f9b71153f4f6c4a8ff0654f8d967385eeea5e83b746a872222ed86d05555
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that function as a link farm, pointing to various domains, some of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user interactions or disguise the malicious intent.

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://catamma.ru/uplcv?utm_term=smart+bro+app+for+android PDF link annotation
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/58634974855.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/55765721817.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/wufimaveredavo.pdfIn PDF document text
    • http://charivne.info/images/file/93382843733.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cf0dc3ae---kasetexefobaxijavapavum.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210905022100.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/51321107813.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3559c9a---wufakufululesuxusogelubu.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nokifix.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d266d6e9---pumuv.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/88471875086.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/80499229381.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/24971958968.pdfIn PDF document text
    • https://2acontractor.it/images/file/jiludobufaliduzoris.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/80254861620.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210913180738.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/97583120382.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/balojixapifegusolarizax.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/sofakanex.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136785e68f9b---ranakum.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/48066084900.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/sisozenenoj.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/97930793564.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/43682183445.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10528 bytes
SHA-256: 6ba2d7941293224bed65659ddd96235504a4a14ee0a52dca89aaf505f129e050
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 17332 bytes
SHA-256: 76d41613b35fee888303d255057d7943b08c49b1049d19c4255b8945e510c9f6

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