Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea6fe754e8b9483…

MALICIOUS

PDF

88.4 KB Created: 2021-08-07 21:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 73c369ffeedc38daf63da6343206122e SHA-1: e80dcd0c1609893a219489a7fae859961a5aee9c SHA-256: 3ea6fe754e8b94831edce5f5078c69b0b4d481a1ca7b271c96e412e79032bd67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as phishing and a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=jimikki+kammal+mp3+song+download+128kbps PDF link annotation
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb126dde46---sazosifefi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jeleritetakajukezi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a437fb6218c---farezotak.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8525a21a04bb5308d91cbb272e153c3b/siselelibiruki.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/wevejerufun.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/sifilikarosi.pdfIn PDF document text
    • https://avela.md/userfiles/file/70429601213.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/91824141577.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xalokixubirepeleduvelaze.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c18c5944e---88126643160.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb061fa909e---98477748557.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/20968449512.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/52977322918.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dikekumadulufuwapuk.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/10f5d5f0781d40260ca981edcab599e6/12116595488.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/75917420245.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/taxivafi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37112110903.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/bofifabibigatajej.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/52476988434.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5960ca7---fexegegafejilofodujimuk.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/66993690202.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607236b42befa---65156890918.pdfIn PDF document text
    • 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 11268 bytes
SHA-256: 01bcbf65596769886324833d017419c6cabcc9772d6cbb0ee089fe6a9cc7d1df
font_01_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 17096 bytes
SHA-256: b5d6cb0667f42384e5bdd2dcbce0cab395ab235dbc7f06f6a2a93e960a0104dc
font_02_sfnt_off00013b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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