Malicious PDF — malware analysis report

Static analysis result for SHA-256 75938a2bc03559c7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 23:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6445e554d51be700ba291ee96c2eb907 SHA-1: 907b4574e341bd92b5133f828d888e3b47878087 SHA-256: 75938a2bc03559c76789dc892a0dc37468bad2f83e66deec1181c67bd2201797
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medvor.ru/uplcv?utm_term=encouraging+words+that+start+with+n PDF link annotation
    • http://evolution-dev.com/file_media/file_image/file/8816784123.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/92690238603.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fotaluro.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jhpddc6mviksuiijjdj6procv3/8701937051.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99654419715.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16141719c575d9---degobeb.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/88047583508.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nimusadowimaleziligavop.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9645c0cbd---24071491674.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/52218757632.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/85395753458.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1e79a1d0---92277161921.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/36341386083.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/tidozubojapaxalowapokeva.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n13rg58ehvj0doalkt7jogthk5/44038078028.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bozuradenotij.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/68492679384.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/63068968233.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/dolasatibejejalusurazo.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908171900_033br3.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8f40b0a6---sekafavuriralumekiwe.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/72995126596.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///95528512439.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161340834e0908---78629973789.pdfIn PDF document text
    • 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_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10640 bytes
SHA-256: 3d37e3e6cc374dd63146bd3891c79de1c30e01cf590e2494b6f924f39068ae23
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 17840 bytes
SHA-256: afd57cc24a644a31412afe999da28be94eed31745c25505663665555c09378e8
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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