Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf94b7886b8d4634…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 23:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e2d879da9698f3b8a68166fa4ec25ce SHA-1: f81610ca74b6f1680fc5f33242e3b30437b53078 SHA-256: cf94b7886b8d463490a1b9e52b1b85a1fe04f717303d6bde4b243e39378c2886
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of JavaScript and the link farm suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.2081

Heuristics 6

  • 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.
  • 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://sallytour.com/FileData/ckfinder/files/20210906_D7C05279910D3EF4.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614202d50df97---91557464999.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xogilima.pdfIn PDF document text
    • http://dd-eng.com/files/files/65198994277.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jibulunozodevubuvugep.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/dalujapatokesifisaj.pdfIn PDF document text
    • http://lovesenergy.nl/file/43381768296.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/14080816794.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/837133275.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/fixajelujavag.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/rawusukeridafujuxorewuwu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/33ac4fbee07ce95719cd2bf175687a06/31963181692.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913161341.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/65782021833.pdfIn PDF document text
    • https://wita.lt/images/files/20496020469.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/rufox.pdfIn PDF document text
    • http://esejsc.com/upload/files/98643031411.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/14004431454.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/elooau4kpongd8noaeck541dn7/juxinilexativonon.pdfIn PDF document text
    • https://iwistw.com/upload/files/26301353205.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/79656825951.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662e3d43e4---zoluvev.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/dibep.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/vumizaguzuzizorevedixisew.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/jajelofosakujekipeg.pdfIn PDF document text
    • http://wsm.hk/images/files/3349047953.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/pemilakaditebokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=apk+heavy+bus+simulatorPDF link annotation
    • 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 18312 bytes
SHA-256: d3637d551e9c28fbd86a1e0939e92fd6e31ae11eed5f9d131dbf999e31202e2a