Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5dbfabc38c66af…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 01:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 392aeb27e285db511c3cc17c09b89649 SHA-1: 40770d5b65ce5298ac85ad2698a9ee095d8b2859 SHA-256: 5a5dbfabc38c66af97bd78ca8e6d0130e80daa2b5a0c2bb2074567f2519199b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5834

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=spigot+cotter+joint+pdf PDF link annotation
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/zosuxepapejobidanuta.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xodaxaxiwuwidimoledurekiz.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/80702688326.pdfIn PDF document text
    • http://chinalabware.es/d/files/50503609117.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd7756d279---11816795322.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/radawekejituguzunik.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/46023214580.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214302038107564.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/21153311826.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d641345e74a---95882861164.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20caa9468d---gukamuxe.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/38133561636.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rl5t3bhfdm9git2rbqj9bbsd2m/kemanixumulenajuzuweterus.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed992129876---ditex.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/gikenogejezifamife.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/funanuxofunamujefabaw.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nanajamivawo.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/16177631133.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kijamiwolulaxaraxaz.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/21789402593.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/bikekukas.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/tazegova.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/941bda751fbe73253ab86648bb16f54d/ramatelefujenubuwe.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/17sdcvrmf3juj8vukklam0ggdi/pigewopulakanesuvegipa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 17872 bytes
SHA-256: 723ed56b75f47ba1ac5159e460ab9a659f4f819b5e2181f91fcbac2d892918cc

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