Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aa6029f02fa74b…

MALICIOUS

PDF

65.6 KB Created: 2021-09-24 20:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 336fc01ed19795a11d6c885647010c8e SHA-1: 49f1949b6151ad34dd19de4288f554828844d05c SHA-256: 72aa6029f02fa74b082e32538561806d29b5038396d7533b39f4ce851e4a6ca9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to potentially malicious websites. The ClamAV detection and heuristic firings indicate it is a phishing or trojan distribution vehicle. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, offering no direct user-facing content, but the presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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://huntic.ru/uplcv?utm_term=zaza+remote+download PDF link annotation
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/23729228562.pdfIn PDF document text
    • http://spbi.cz/res/file/53566591875.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/5514025361472644668c8.pdfIn PDF document text
    • http://annabarons.com/files/files/zizitesejefijixogan.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/91514862833.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/mizamarulukipopedowoje.pdfIn PDF document text
    • http://artio.pl/files/files/96252060389.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/46560845858.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/10655900148.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/94953248580.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210917041304.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76288d398---96318484289.pdfIn PDF document text
    • http://espicycooking.com/files/file///neworomoboruwibisij.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/xotewefosez.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/jatemedurofebefagejunos.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/37076543140.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146dcca9ec24---milibapaxarekaji.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64066365283.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dupiguxusinasivizebuvu.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/28963743029.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/taxitegizewuj.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f010dfd9daeab41f70f25fe5924929a4/fapejemuga.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109012106529087.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/buxet.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148058ccc9f8---48166228344.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161457abb22995---39033727846.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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 10260 bytes
SHA-256: 7e22248293a4e9fefb386657d4e1b63634f1a0e28b4fea2382be1086f3698acd
font_01_sfnt_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1