Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62df98489f7b6a9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-27 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84317b5900c1e3364e34fbb3966d762c SHA-1: e14362ac787ba08640de3597b03e329114ab6d7f SHA-256: b62df98489f7b6a9ce5da6f77df667f2841e2372c7e156b8cfe9b65b5efa7d91
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This suggests the PDF is used to obscure malicious URLs, likely for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=parkour+games+io PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f8b6c388---pizekep.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/65384719813.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/kilododogogajuko.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/ruwogoramikegikamar.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/61784021625.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/sopogemel.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/76528449635.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910163230393920.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144cff1906da---97678721853.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/zebajuleman.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/8820429025.pdfIn PDF document text
    • http://expresskaliski.info/file/36215291067.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210921_D5D52022C95FB60A.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/mugesivawakunenaguvine.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b756486e8---11624544221.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50185939337.pdfIn PDF document text
    • https://motecx.com/images/file/liveruxad.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae2f9b1a3333819f948a2a27268b6c4b/70648806024.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/28579961513.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/20061707196.pdfIn PDF document text
    • http://greenbrier101.com/userimages/bejetasibipojifosafi.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/31362849165.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148369c910bc---77331710806.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 19964 bytes
SHA-256: d649d62f362cfdd73eb00d4c8b1c8eaad2e0e2876c04092bacda1813158b4ec8
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10396 bytes
SHA-256: 4fd71fb0082e134dfd30bad3fc5062fff01b012bbf5038615bd8e79fe4ade790
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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