Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19674652f84b00b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-20 21:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3cefa730d7129585c27976d4ed124c6 SHA-1: 58e1d17827b4c22a9ebcec1fc61a6a85c96ee319 SHA-256: d19674652f84b00ba2cbbed1e57f3a0c79bc44aadc496de5b1ac13570cc13acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tidymoney.com/ckfinder/userfiles/files/51890212480.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ac4bb00c---18040000655.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a56cb061a5---mafikikomupowojulorebe.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210819141302531.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbca5a87e7---5207609838.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9df436412be2d7d3950b1c8d0408a7fc/zivozanelisir.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0eb27bcf---29660241808.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/waxanodorefixenujetotofim.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/74601943969.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116ecc43e118---99517066373.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/zasobajaluzosemugufuwebe.pdfIn PDF document text
    • http://status.cz/UserFiles/File/sutagegixoxenidutedis.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021081623215673499.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/lezijuk.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6181355a2---gaxipujizivodujalizokev.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/1845813861.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2ecbfb58---70719541389.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1882ec22cde92bc261b71306c3b8c0a4/49417108437.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a755b5be3d---82531005795.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zaxemo.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/rabewadiraxuwimimo.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4841975348.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/62a90b0d2292ab63083913c73b6d7afa/botejaderibut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=volume+of+cones+spheres+and+cylinders+worksheet+kuta+software+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 11248 bytes
SHA-256: 1d8c80f894d570d1cee2749e7a87b8f38aa51ad26bdec536984c161f649b428f
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 15924 bytes
SHA-256: 3fe8459a96a3242a50f7627e3c7f0a562a66fd8c11729f552c3f83c93756fd58

Open this report in the interactive analyzer, or submit your own file for analysis.