Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5969867fbdfd6aa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 15:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 014081a867eeb99197fd301c79716baf SHA-1: b624836b0eafbc8192e9f2749edb52943bdcb6db SHA-256: f5969867fbdfd6aa6a31a035dab4a3720305454849d02522323dac92c11e3f71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to link farms hosted on compromised WordPress sites and disposable domains, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdf In PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/lubajujisejazevotebid.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/rovuzatejavetu.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xojapojig.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/dujasigokoliruganek.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/85202419004.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/sevotopajajufok.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/68773090299.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/63412546669.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/japokidosaj.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/53498394382.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tarevabid.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/8253253546.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/jovivetilu.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/peveputuzomedi.pdfIn PDF document text
    • https://superpart.com/files/18765801497.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vlocqe207t38uc65v34g5js6m1/kusimegurudimafinot.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/1574325741.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/da8248d5951f4ec03c9b6299c2c034a8/nawajukubebov.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/8600158756.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140243cefa48---27751126690.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/62450803546.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pulevut.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/pilojotezariminoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=miui+12+download+for+redmi+note+8PDF link annotation
    • 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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 19208 bytes
SHA-256: 16c0ed47a55adf834f3895c6831532b86f69444371af53e5baf8566f1d7f1c7e
font_01_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 10904 bytes
SHA-256: 460f2ed23e9b4652d1468981150685cdc29e3b30538b5c665076d2cc62a51d36