Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0441cfe7fc53dce…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 02:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6dce6f8bb13ad09382ab6defdc84cf65 SHA-1: 51db2d04d48d117854dab5a5c79b63ca0aa84b94 SHA-256: c0441cfe7fc53dce2413e4a6085c7c275d9dbcf00c7c6675627a0e4a720c8d9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous distinct hosts and links indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9631d4f88b1e10d8dafe29d4ada367e7/91246629825.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d65e4d39f0d1c67551deea3ba4fe9f93/puwatiteve.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6efje9sdankns9qm325v73n952/82588729411.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1913b906a0---7929988738.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/nagukebokebu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609614d25db06---mikubuwafigiro.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/377d7a837c1b4a3898ab7ad6091b3a1c/42189781147.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/zopolilar.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/14281812994.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vavugunuragosa.pdfIn PDF document text
    • https://peterdegendt.be/file/ligepalukulas.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/28518b8868100b82332ff26db835bb46/69846281123.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/fakixewurovejefoxixedo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/84412862738.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ogj9fmck1bccfprbl1v2th6k56/bukaxizis.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02112f001---juxidejijukiv.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/sewekuk.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34106b1554---gidinidesefijuzufinelef.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/tutumajurilud.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074047edec86---fejaz.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/83390308973.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/savodimeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+crystal+jellyfish+eatPDF 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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 20380 bytes
SHA-256: 589ce2660044b4c92b7350dac05e20de536754d2d86b038dab75f28bfa249da8
font_02_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 10704 bytes
SHA-256: e89b345f3f6e08cf7defac116acc9e1474bffb367ccfada5196d64f73aa1f56a

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