Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c608c0d67accc6…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 06:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac56b4a1c034ffe159b3109b520a4104 SHA-1: ea954993b7412e2d1e18aaf06bd7cc5f24cc5f4e SHA-256: 76c608c0d67accc6c658af0cc0db85fd80794ebf1a3f076c5e38a2857be96afa
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and potentially disposable hosting. This suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6339

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 http://fashioneducation.ru/userfiles/file/faxisagusafufu.pdf In PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vaximej.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50688163993.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/mewibijaropeparejufe.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/14925237392.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/sejuzoji.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xodukip.pdfIn PDF document text
    • http://pjteam.hu/uploads/44388088967.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/56295701833.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/34259107448.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3a14916060cc2a34c304ca8aac2c80e8/zeruzemumugegu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d3ee87a6---99988554406.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021620823253579.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegolumizopofuzorusi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9qkgvh2e5kocn6j9gmhbu4bcg2/rotowenexi.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/mosakagilizez.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874585056ea---sijudofemofikukebekamej.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/gekovagus.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62481568121.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/28960576252.pdfIn PDF document text
    • https://uangraja.com/contents//files/pimiwejaxexud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=manual+muscle+test+for+coracobrachialisPDF 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_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10836 bytes
SHA-256: 89edaf22a1578c5b314a92f3fb7fe05c57ba3d65220283021d69e2b5e821bafb

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