Malicious PDF — malware analysis report

Static analysis result for SHA-256 327a6a72b6f2cab6…

MALICIOUS

PDF

82.5 KB Created: 2021-08-14 16:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 003ffb9a868ad56a36ac6b0bd176d529 SHA-1: f5a4e702716192b293a5f2773f71fd67647fe0b8 SHA-256: 327a6a72b6f2cab6a638740b4114566267f1e2339d23de1e469f64f6d596a696
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple links on disposable hosting and compromised WordPress uploads suggests an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9437

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=foot+to+meter+conversion+calculator PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c7474711---vabejazububup.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gosorumesojunonok.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/wixilekediwupir.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/binuxalaroxobutij.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xosuz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/buvitat.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bsf3vhfb9om5jbn0aernucvoji/66129401398.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/bafeluwufegivabado.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1rre6856n5airk2vu0nkrcr29v/pasemamojovokamibujisofa.pdfIn PDF document text
    • http://jngf.cn/files/file/99947695472.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/kuwegasowidaporubumaredid.pdfIn PDF document text
    • https://arerp.kr/data/file///44982006277.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/62cbd2c10c730a90deefc77333173f62/wamovigolanegal.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fa184caa18a---88142639117.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jawuzojaxalekasupovixoro.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b4bee62c757aa189e62aa75506976a08/joxowipuzegowulegi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/53072605555.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/83552294947.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f762356---luxejeratudutezarod.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3a7ec174a04cf6719919ae727a7ca9/fuwaterubow.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/rorofonikaxojifakulag.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jejomegujozorejubulo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7b9e8rcnegsoald6saqur5051b/9666906690.pdfIn 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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 15944 bytes
SHA-256: 0cc6dc03492c45c70f2582b9ca2e057cec825b8f43f44e73dde5b0eb54f067d6
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 10536 bytes
SHA-256: 79851627c96f3e8722aa8851db8f398323442434ec85cfceb836dd2ac878b3ef