Malicious PDF — malware analysis report

Static analysis result for SHA-256 527878cdbb35a898…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 21:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cdcba4dfc0f779f83114bac4f6717070 SHA-1: e07a5bcf127fb7f2a133decb86e630c60e4c1fed SHA-256: 527878cdbb35a898876f4f068dc0538f31031f1f063b80a7cb104e4be1acbf57
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/1607ce400f2fe6---giwuxujonelofobi.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e31bf875d89ae99be50c57a284298a97/7662649541.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/runoresuzu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085425eaa556---47213239569.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd9fbe003---guvudazezusezisebanatisal.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/33233639504.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tinifelanironigep.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pidisevotibonigelubotaru.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc82b253f---23463458527.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/44296081718.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/35852886283.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6030e726---34782321209.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/18f23f3c9991996fd4199574b875d840/fapepikigamimonubitimim.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6ee6315---jariwasinepewavi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b7686d7c---17729444079.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vakadawuganifigamumobor.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/19182466430.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/bomubuvowenilegerevefar.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/93405350538.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/u6fnf0ha9mbi6k8us4c2tp63a6/45295505520.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b2b27ba2---litegomumakigivem.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/31683469405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=atta+bread+without+yeastPDF 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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 17356 bytes
SHA-256: a46652d637676cf26db50e214ce9f975f154702064f5d226b2be4ee0ecf899b4
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 10616 bytes
SHA-256: 07abbcbe09ac4f7912a314f9dbdeaa0949ab520d3d076249f41e4ecfad5a8305

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