Malicious PDF — malware analysis report

Static analysis result for SHA-256 def302774d0e1956…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 13:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acb4c64c145364c7898eef811f59f0c5 SHA-1: f6d9d017a83b28eefa7b530aac46145c040f1b51 SHA-256: def302774d0e19562d149bbff3a54972aab2ce7ac64c5046be229b93b885c496
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download further malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links on potentially compromised infrastructure is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://burstallconrad.com/editor_files/file/nidapavaxilumuberolisu.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9eace741a---34809345654.pdf
    • https://ebooksweb.net/files/file/76698188679.pdf
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/tufisubepobonoruxagil.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ncoafm0p0dl8ah5hks99fmpslf/54893967073.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c287494e3e6---75181358028.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/65470349373.pdf
    • http://murasakijr.com/uploads/files/mowexapovizasefibirobipu.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mh8mj800oem39r0lsom48poh6m/tepodalirofiduvazujisuto.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b8e10b5c4174a7da032f38e87bfe4259/42252310031.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7b1d8a5cff1454c0be852fa08ffb271c/62673135494.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d32dccc8---10461688702.pdf
    • https://isabellepieman.com/userfiles/file/bumefezupaj.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cfck2ehntjqoccheb4va9eh7v9/pebefeve.pdf
    • http://georgefamilyreunion.org/clients/86186/File/15202254715.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf84b3e361---lixavepomomunewufi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=toy+story+4+123+movies
    • 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_off0000df65.bin
be3141d3f07689dbcc7ce90236ac57303b2e1c0086337d9474ae8c6636b78bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10524 bytes
font_01_sfnt_off0000f796.bin
c394c53a094d0a256a7a2e7a0041c4cd8babedc816bfe30071ceb51ba2743ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 17144 bytes
font_02_sfnt_off00012437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes

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