Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e5c9e104b94a07…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd98c44ace3e2b344d93ef781e92405d SHA-1: eabf40bb38e1f624584af7fbd116bb08d21ff9f3 SHA-256: 35e5c9e104b94a078ebbbacfb81e7b3e7fcd6d4a8eabaa8dc92506e34544241b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of these elements, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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 https://crewmak.ru/uplcv?utm_term=message+not+delivered+to+android PDF link annotation
    • http://www.sun-green.eu/ckfinder/userfiles/files/xenumoxufofajexediletiji.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/28588847629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33902f59d---gopavuvoki.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/11311020398.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58879406812.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sumelozitufekutugigutu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/monorilenev.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/zosirefagu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354fab891---dimifofamufodipunolorub.pdfIn PDF document text
    • http://viorina-deko.com/images/file/18881168591.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/ziviloxalakekox.pdfIn PDF document text
    • http://allasclub.com/campannas/file/6202221816.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/8742454752.pdfIn PDF document text
    • https://somogyplusz.hu/files/54713697705.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/guzawipusujexegif.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/nodititidibepigowuwebefin.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210909231648740692hbu8j5.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03c9de92---21810158106.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/risogefezokaf.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109032228572412.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lenubesorodabanarapo.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10480 bytes
SHA-256: 948e9e20f026b15f9a1c45243f0cbe73098f805eb81cb9c937e161d0dc3123a1

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