Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89c0c174e2bbc2c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 07:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ac340980512d8f8e7ed38790f289e15 SHA-1: 5946909b5a934c51442f8a29ffbb1a0444ef5046 SHA-256: d89c0c174e2bbc2c47fb485ac5bf0d56dc4fa9da6e4494a8d70d868dd503f9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Some of these URLs lead to compromised CMS uploads or disposable hosting, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://degeninhotel.ru/admin/ckfinder/userfiles/files/divakanepoboza.pdf In PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/48511141893.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mekofuremazotok.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44125d2504---kegij.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2890602c738c204d063b3e3906a47bca/koxazegag.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9ed7e627---44913745008.pdfIn PDF document text
    • https://tavio.ru/files/file/daxikajirasajowibipis.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/pogifojozifizedegumedo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5316d7d0---70445899708.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8cdd63b368fbfbd3b970bf97720e374/29103195245.pdfIn PDF document text
    • http://cosyromania.com/media/file/52536452002.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161074fb425bf0---84157363921.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/4085378472.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/dunavodimiw.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f354e704---62449621859.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d684e1b16ea---xasewelemufeketeb.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c9h7l5htmiiek40t39e2pb2bg9/fuwezulude.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fapebawusolaketip.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e484d9304---nesexanorabixufawed.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/19ca70f4e4377ff7be7ae84a0022b841/fexagi.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/turagulemijopixitusufiwod.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/q2ju36c447inetoq3b0eqlupbo/8030917314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+connect+my+bose+to+my+sony+tvPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 10620 bytes
SHA-256: a98654debce472f9325a14b6da909f83b5cad3f48521d361dbdf9f1fd7467758
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 17576 bytes
SHA-256: eacdb75091090b4f8aa38e269e6fccbc5ad18095fcb99b7465287f6698d6753a

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