Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e38967c7b4f475…

MALICIOUS

PDF

97.4 KB Created: 2021-07-03 15:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc6a813273c39761504b36b26f018432 SHA-1: 1bfe31ee873c6cb7dad31d6457817790a93db1ed SHA-256: f8e38967c7b4f4750d1632d517b9b5855e0910fbfbb293749c268ff26a2f1f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=dragonblade+riven+price
    • http://snotlicker.com/clients/10243/File/72525760149.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9fed6e2b---kiperotajufofadepuzo.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/70aidp9uoum4l8kr81ukicpdfr/munerexugizu.pdf
    • https://clap-bas.com/userfiles/file/68114230530.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef26abe67b---72805205182.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933045b725d---45840394093.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa37099779---ribubixebelowodugerilasid.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082484b6bac5---bamudugerewojaxuvibeliz.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160881681cdea9---dasowodamowuwupeso.pdf
    • https://congtydaihai.com/upload/files/zuten.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/324e2781bcd2ed4cb3fa360425ba9336/31099201226.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c885936707---zabam.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7f93498b---vobudenerinepoz.pdf
    • http://alumcity.ru/userfiles/file/zuxize.pdf
    • http://bienbao.net/uploads/files/28906957987.pdf
    • http://zaun-produzent.de/userfiles/file/78842805590.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3ce73362bf96c58892243a0ebdec45c1/60958566271.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075223c25e0e---fawuzibukisibebapi.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/zaxufepozuluzatefunosa.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132f520510---wotaluzazijozinunenagu.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a76718c3139a06d14260d998c8a0e575/bivutebadinofaputodifipa.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6077b5df9---86533632236.pdf
    • http://kalikraft.com/images/file/potulatevenaligegamuna.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7fqad8otj1gssn2ivahvhk6acr/79518367155.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes
font_01_sfnt_off000134e0.bin
24501c8a80ee20263af5e9cf7958029994f9320e75784c474af176910c94686d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 10632 bytes
font_02_sfnt_off00014cd0.bin
829951a1607cad2c1d889c5f8775d96a2e61958ba08e9d7f950f1d3d52ee8351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD0 16364 bytes

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