Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57fabc455a65988…

MALICIOUS

PDF

64.4 KB Created: 2021-09-30 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 758761fe36998c44758e89d776765eca SHA-1: 0090d48cf886bab0f09be7a298431d79da788259 SHA-256: e57fabc455a65988bd6d8e364e45610cf370888ad0331be0ddeb715814f0ffab
154 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7407

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=timber+ground+floor PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p8avurtc1tilckgfvtthod1ub5/degolejexa.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/6417214101.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43159557337.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jatetomesipiro.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fukikoxomelotapivapikagi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/58334950996.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/98122191628.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/60687003568.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/wokagefozod.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lunoxuxejiraji.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210909132021.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51214454790.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/518e73feab31db770f1353b1d82f4318/97682670825.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xowozoletupubogaguvek.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/bapeguzurotaminupaxozopo.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/monatuxexopegaxe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f3c95c4b---gosawiw.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f3795585db3cc00392c8a3c9be67cc01/dufigemilogofipawida.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78d28be0b---51563911019.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gunuvisuk.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/dewakabido.pdfIn PDF document text
    • http://storemisr.com/uploads/files/4883677508.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/65071161340.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/17284391408.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/numeligozevopoga.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 10472 bytes
SHA-256: 189b07402a032a2dbcf80a9e82b0492446e2c14437e0d160b96521cf8dfd39c7
font_01_sfnt_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 15080 bytes
SHA-256: 460b34fa14503d30680c95dca9c47c3c3a8973cd0bac6ab0101ab29dc99be6b4
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1