Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1b9bbbb8f6efac…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95586fab131256edb3e7c416d65b8d3e SHA-1: 4a81f5b4f5361b6f36fecf1cc71898912e85073c SHA-256: ad1b9bbbb8f6efac65eb1e8f9319eb3f027f1c1928f8d5e30e63e762c83ea902
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kalitelivideoizle.com/resimler/files/53938263843.pdf
    • http://instit.ac/ckfinder/userfiles/files/41917125296.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a2ce382365173d423885da0083df1198/nufalutuba.pdf
    • http://lumieretvie.com/userfiles/file/jemosipawew.pdf
    • http://renovfab-menuiserie.com/userfiles/file/panitaputusumewuxopedupa.pdf
    • https://mimpiindah88.com/contents/files/kugipumosiladutoxibigejel.pdf
    • http://k3projekt.pl/uploads/userfiles/files/89833580765.pdf
    • http://newo.ru/files/files/63121381589.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320cb26be17---tavuxutusuvuxuxiketi.pdf
    • http://www.luna1956.com/images/library/File/17790181982.pdf
    • http://apnschool.in/singhania/downloads/file/54972315676.pdf
    • http://geyikkimya.com/userfiles/upload/file/riluleripotawejesanul.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/45741004061.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161374028586ed---jewow.pdf
    • http://milwaukee.center/userfiles/file/doluxaliwiserujo.pdf
    • https://groupburuemas1.com/contents/files/58735309832.pdf
    • http://stjconsulting.it/userfiles/files/19007146998.pdf
    • http://pzhjintai.com/upload/files/43525251604.pdf
    • http://proallprint.com/userfiles/files/58484356131.pdf
    • http://tns-china.cn/editor_upload_image/file/4219638229.pdf
    • https://quatcongnghieput.com/uploads/files/bexubulolonobubidijox.pdf
    • https://bodzlomu.com/userfiles/file/palexixixo.pdf
    • http://thietbibepnhahang.net/media/files/27214513849.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=build+android+app+with+visual+studio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c5.bin
c123406ee46724a947cdd4c568f64b4d673a78f3c9adcbd9153a7c7fde4848c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 10660 bytes
font_01_sfnt_off0000ed28.bin
5b68f8eb868ae3edbe3812f8c2417871765e9ae855bbd818a1ca21aaa467ea8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 19336 bytes
font_02_sfnt_off00011f46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 16792 bytes

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