Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ec04cc05a6aab5…

MALICIOUS

PDF

75.9 KB Created: 2021-08-28 05:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56df7fe844f04b7ac4604fef881b5f80 SHA-1: b76005103b2f64cdca92035df89c28722056e91e SHA-256: 75ec04cc05a6aab53c12c6edff2913f38bfd31dc377f60284f909f1c762905fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The presence of embedded URLs and the PDF structure itself are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://medvor.ru/uplcv?utm_term=cats+of+all+clans PDF link annotation
    • https://myarchitect.es/ckfinder/userfiles/files/nezupamomonusepapajuwuxo.pdfIn PDF document text
    • https://brs.jo/userfiles/files/muwunorotet.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/93010430624.pdfIn PDF document text
    • http://abroadster.com/files/somawis.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qmrinhhsvlc85sdvk2a6rvtvdv/ganobubasipa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/497c912d28be757025375b6fa96d0f94/midesan.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f81491aabce2871a85db40f58b7629c7/9395023353.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/44977070865.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/12494979905.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/bojuda.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/susedafixunokusegitep.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/bemil.pdfIn PDF document text
    • https://udruga-invalida.hr/files/59364566681.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071df4881cae---17322617196.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845cc53e2a---jugoju.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dea5bfe20---gorozuridupiwegipi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/79863125611.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ffae0d0fb93bc69ac72941de9cd8362/52204472585.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/dorekasevowazopezevufuf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d242197c5---44437123724.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3d27d790be2a3b296c5a48344278c967/robelawediwozukazufip.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/48649995193.pdfIn PDF document text
    • http://klhl.com/userfiles/file/folexotajukomemojomiziki.pdfIn PDF document text
    • 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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 10036 bytes
SHA-256: 838d7bf746cc4f3aeca71cbf2c819701726303211283b9a5d4fd328d64293185
font_01_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 17308 bytes
SHA-256: b7d7bbddb8f953a6ca956a2e4c12c685ecf53caded1f7528ab6282a335020494

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