Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2252791f4ef37e5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-22 12:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d0537f0f8070b62efecd2e0d8822736 SHA-1: 833b880e789c852166f39005f39ae965ab353c3f SHA-256: c2252791f4ef37e5a1977480a11c052667e8fd5b0fd29c1fd4866cf373fc110b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute further malware or conduct phishing attacks. The PDF's structure and the nature of the embedded links suggest a deliberate attempt to leverage compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5ab0ae6a---zesezade.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db09f0da76---kaved.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390f5158c---zemasuxemitilazitefirola.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/88622069877.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f777ea7b92---21835536271.pdfIn PDF document text
    • http://chinahongji.com/d/files/vitegixagevojur.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/74774351993.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8b0330cc613c1a0564ff9128eaef961/30240875311.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03b0040eb---burabavegajuxuju.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/46925528314.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kapiti.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/70e29a1a873098e0c29a79c75097aeef/mexemibowe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/gemowomafemununafabigexug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f80d73ae---dakimafofiluxarejol.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8feb54660---55775237194.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc71b63ed26---54918306130.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa03a7f636---70698886299.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/xaniwe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/77613c783df58d985ab10c142efdf671/85689881967.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e6b6f6aba44c2e2640d425c3d22746d/41378312199.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b909ae521---69546957391.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfnbn6vnvl4500vib79hhdvee1/runebik.pdfIn PDF document text
    • https://virker-ikke.dk/files/momazafe.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210612010356.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pre+experimental+design+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 17568 bytes
SHA-256: 56282b20e9be50619ecb0834b2e24227f6585a5e662abe496b97369fd02e8671
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10720 bytes
SHA-256: dc9956f1ba06f87caff408a1a4ab729ca24a762b8e8ab94ace5f86b5d99fe073
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 2732 bytes
SHA-256: 0f26f8f568a326ff8c15358e6b2095e797d5d046a758bd2f276689a4647a6a7b
font_03_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 16416 bytes
SHA-256: c8e144b1c5f76f4b85414eccaf1abcf5f3dccd1201a1c92672b068e283a8a508
font_04_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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