Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e555b96bf7c639…

MALICIOUS

PDF

65.7 KB Created: 2021-09-18 15:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 022c6d2eea96840023330072e97b5a53 SHA-1: 1e9e0d050bcce78c7ca7c4c3947c094932eb012d SHA-256: 36e555b96bf7c639148e927d703d8aa2d939b7c7161df3f59f514264e68ae490
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO poisoning lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

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.
  • 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
  • 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://enricobarraco.com/files/94358869965.pdf In PDF document text
    • http://studiofapas.it/userfiles/files/15843646239.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/navotanujif.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913203503.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/gekurezagagadufef.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/83574cd788e286d6511306769ae89172/38100341303.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/betajem.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/5821252322.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe733614e---24564457903.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/lunosesi.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/pulofavesafesafebalamaxad.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/dororowusibonekopiwa.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dalevizuroboxuvujikosed.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/mufetotojolad.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68713685948.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/senelexolul.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/56730025964.pdfIn PDF document text
    • http://sunway.me/uploads/file/180713585868.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/60622444353.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/kaginawosuxuvet.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56ca17adb---megadepusokigilomepa.pdfIn PDF document text
    • http://change4best.ru/upload/file/61755938144.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/53042124798.pdfIn PDF document text
    • https://ccskin.com/geektic/files/53948556341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kingwear+kw88+price+in+bdPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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