Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c969681fb9cf296…

MALICIOUS

PDF

93.7 KB Created: 2021-10-06 11:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 198a073346f879c0813af62588100cba SHA-1: b6f86f9f6334c07fcb160c52bfcf6041ba5cacc7 SHA-256: 1c969681fb9cf296237c5ca1989c77e8a3625cd1df9412cb43c24126736bbf03
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed a link farm structure within the document, pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. The presence of numerous external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

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 http://zartmobilia.com/userfiles/file/20210929140131.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/po8pdjpo86djr2cr3uu3c62n7c/70083943104.pdfIn PDF document text
    • http://cke.hk/userfiles/64752108626.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/23718124215.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/devosagekexapupuban.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62040249762.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zebazilob.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/65953511713.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/af2pr8ln4qqv5malajp5d44nkt/49304955943.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/28127695574.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/rinegopopinuzonazazofu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8788227e7---56235999363.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210906_135246.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/77240882358.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d84d7aad35616c10087b68e3853e9d36/66433104123.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/53140086316.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/60608562319.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/25575367972.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210918_121357.pdfIn PDF document text
    • http://hodori247.com/uploads/files/16348011808.pdfIn PDF document text
    • http://asustainable.com/global/file/14664631596.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/50913725137.pdfIn PDF document text
    • https://maisonforville.be/documents/file/dojubuvenugiva.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/69324727879.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/digesozuzolebibeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jodie+foster+in+the+silence+of+the+lambsPDF 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_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D68 10872 bytes
SHA-256: 97874e3f064025000062d6a3e83cb13bc6e2889c329ac8d025ad9f2a86a602a2