Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcbbd5e32d1a644…

MALICIOUS

PDF

96.4 KB Created: 2021-09-01 11:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a44a422391da95234be79a1454e7fb9 SHA-1: 8d238b062dae4bb13bdde4505b6352aa5045c4cf SHA-256: dfcbbd5e32d1a644aa7dcd2f6b2e852c87495125aa508a7a8234d045f0e46e82
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://doks-films.com/pcms/content/file/89693275441.pdf In PDF document text
    • http://blueyee.com/upload/file/1407425224.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/68666997849.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d254385884---14008801875.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3m99q2fn13v9r53frdjp3tl2a3/jafonijiboke.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/verawabixetibifesatovovo.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/58481487788.pdfIn PDF document text
    • https://wildnaturetravel.com/File/nuboduporoboposamor.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866c125537---jivurizebebu.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/87508756910.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210629_CE93A9F57368F4FD.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ef47543947aff1cbe5c70a01c501ea40/29864125835.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084411063611---vetigivokixomotak.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/tidisinafotukine.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/fibosisowe.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/87fc0a3f3f7072b17d0f4439edb8d95b/nesole.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/69649736866.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/15789415597.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/maxifijujer.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/17251818206.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo5ctul2a5o8q8b4llf6kjl7pd/xokoduxudesexo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272e69d948---lugixavepu.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1021654300610e8c0b0c5b7.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f6336688f38---mutapenabekenitubowep.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/18cfe44b28bbe7c0a8f45179f5044833/84143359597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=classical+theory+of+income+and+employment+in+macroeconomics+pdfPDF 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_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 19296 bytes
SHA-256: cf65aa51b1e824ff9c7b41cdd559baddc14e1a5a81b939ea05fb46a53c68e706
font_01_sfnt_off00014099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14099 11028 bytes
SHA-256: e097c8be77418bf9820874f79d89e5c924998d475ab21cd5677aebed37ddaa5e
font_02_sfnt_off00015a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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