Malicious PDF — malware analysis report

Static analysis result for SHA-256 959d9cd0cb436053…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 02:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aa23e924abf807d7626ee62fd37e567a SHA-1: fc88ba375653104f18ff938d41a824b7013bfdd0 SHA-256: 959d9cd0cb436053bbb9cfd17d4e409a12dd2f3dcf676c5c1d58283ad6db8f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious PDF files. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ps87l0uh40kbka8ie4425ocs60/toleg.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/romesuxani.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160765a998a496---72615076610.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vasuxoj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0b4313df0917915a23a4597d08a70d2b/82133321113.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/61720597681.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95e1ac119---72339055510.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4e4c85d3---21155143666.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ddkd92gaog7c35irn08kisv282/kokilemanikegurusavaz.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jawakemodirevilumalugav.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/7723869513.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/65ke6811hm7s9o1kdfpgdhmd40/84807797242.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/38809754627.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/54985df8367bfaf28742cfae4a3d81c7/66157204185.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/75373819505.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/80790495776.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/pubova.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1f6d9ca1---mekusewalewuzaji.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9473d99d---83501876982.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/88067697403.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f491aea2fd---bixagibavokumuzodozubowim.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/94844156561.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8c47ce14---zevavibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=diagrama+de+flujo+de+un+conectorPDF 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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10884 bytes
SHA-256: c8729c18b448960bf3226c47d4d0c0f62f7593c40fa25f819a157fcd0a025704
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 18340 bytes
SHA-256: 8c719ef06316de92326d905ef81c60c3cb944afd914448b5fc9bec7146c7ccd2
font_02_sfnt_off00013b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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