Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a682a20f5eaee57…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 04:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92545953660f021f568e8479f490ef1a SHA-1: f6824708bc37898ad15a6e79ca9283f3b00c900b SHA-256: 6a682a20f5eaee57a536bca3899e498f500c60890508d54a63d527f12da47dbc
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a high number of links pointing to disposable hosting and compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting indicates a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://at2apigroup3.com/contents/files/vufekuropubajapije.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vadetufa.pdfIn PDF document text
    • http://sinners-party.de/media/file/39501643005.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/fiwavaxudositib.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gb2lisqldcq1v4h2d7hhgrldro/77408894025.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///60877241358.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/40938287090.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109092100002623.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/78694674313.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/judasopoxiluw.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/28810078503.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kivusanidipebixunoziluwul.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/94944767249.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/merewikexusujidixin.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161382b0931cd8---samojiwonafadanif.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/20121159250.pdfIn PDF document text
    • http://orem.mn/uploads/files/rikotolizoji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/00ccd5bdb87ab93596befc17747d2a26/46239858336.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/somapamex.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8379ee458---46399231339.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/90272551006.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a35d7bb19e165860a72f58efad51bcad/30662262600.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/xiziwofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cobra+kai+season+3+gomoviesPDF 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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 18136 bytes
SHA-256: 73b50222864b249c4347023ebabbc6d279a745dedaaa46f86471a1d0ead66aaf
font_01_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1