Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d105bf2e927f1ab…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be1b3617275e8f2086f8061617b96748 SHA-1: da1c287dfb8669a88665cabcfca862bddbbf37d9 SHA-256: 0d105bf2e927f1ab1573662d006c50dbf72c5660058e17049c099c32163996db
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://naturallabs.de/userfiles/file/85394008553.pdf
    • https://mama-light.net/business_school/uploads/file/92989934395.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/effa3031f4aa880021bc9a042bb5c1b1/97659766548.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/583c5b0ee6667b8af0732f7ef5cf80a6/xigusa.pdf
    • http://cpgny.com/userfiles/files/43332096640.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a248df885b8---85295644420.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f8qq15vdju4r17nouedp59i7ts/67689107689.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d202668e5---xejiduvuvosavudog.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b46799b659d---21564396681.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u4meckb3rcpfim0ect2fvopriq/78666306275.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8bfcd5d52e798db2fda4c55d13c213d2/pufogawuxafuvubifuwizaka.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5b5409f---78857961882.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607021c8f2889---38292121902.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160983cdc0d728---feronibitoxowodepo.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccce95048---40229303647.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/108bdab4596fdc13e21a3fa5ff7cfc2e/segoxevuw.pdf
    • http://app8itebarandgrill.com/admin/images/file/29247790572.pdf
    • http://accessprecision.com/userfiles/file/37229180704.pdf
    • http://aeronautike.com/userfiles/file/koxezuxuxenutiw.pdf
    • http://tamker.hu/userfiles/file/sukalaxerivazibi.pdf
    • https://rainbowfurnitures.com/files/files/50805216790.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959db2ec656---43976733073.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a34146db8f6---mopexab.pdf
    • http://acpiindia.com/userfiles/file/91664097834.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caabbcc690---97536897882.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9b18834b502977aa70121a5445cada20/pezijemojija.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=informed+consent+for+audio+recording
    • 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_off0000f0ec.bin
fdbf6787217fb9289524a3f017d6847fa554686f84597a15373a38828c7139b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16904 bytes
font_01_sfnt_off00011ce1.bin
1144543c75e1b9f04d17b862e1cc76b681fb30db67f632fb6c35a0d7ac1668e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 10824 bytes
font_02_sfnt_off0001359f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 16792 bytes