Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4a26395b32c8f7…

MALICIOUS

PDF

74.3 KB Created: 2021-07-01 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb56648f201a1e470ce21c32b312bde4 SHA-1: b2e64f85481f94437c8aa126da1ac2683ca8dc3c SHA-256: 1d4a26395b32c8f71a53278f27be54d8c4ed18fad0aea00f84e4354fadc3bd63
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=living+science+solution+class+8
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbaee79fd---danurito.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e93b4343d7125262855cbd4742839bd5/72168054822.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0544b9114---91633851289.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd72b80d0---vumigeli.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cce06338bcd70dd6f28ce62a1b20b29b/wesowiketusugusu.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/xatixevagov.pdf
    • http://itfind.ru/uploads/file/zaxemedefasugax.pdf
    • http://51-lq.com/userfiles/file///12378939735.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/495bc05266e0a49b1ec9936853d2b0d2/niwewoxexuguzizow.pdf
    • http://solmoda.it/userfiles/files/pefirosarebel.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160813a8c9fb9b---xatinun.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ijfpd481omiq80suf0b5tmh6ik/93005960213.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097516662ca4---roralowolojozafuxapad.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a1c047dcd981df597ae0db57dae13a20/19988372681.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9ecbbf6e81187d867feda0116cc8a9bc/8834420921.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4a908f510c38263710032ca3b058faff/35274721958.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fcdd44d6---88168917146.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/468950ada55c88fac53af72a2067d245/dovukapapuxe.pdf
    • http://dyglas.com/userData/board/file/perapipexivujazufedad.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36e02617f---gogivagi.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f315ced8---vuvamemulaputimewumusup.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/sumevozawo.pdf
    • https://avonsteel.com/UserFiles/file/80707860123.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a85da9143330f290ff0eba98ebdac6d6/98470890632.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_off0000c2eb.bin
5a7ee4494b80d8ad9f032f90756f561dd329559f157b2f1698f01908cb0e8b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 15776 bytes
font_01_sfnt_off0000eb97.bin
0130fccdbbcd4aca7577e68193ed0bb311bf19dfbd13c868532101c0346e11d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10636 bytes
font_02_sfnt_off0001041f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes

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