Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad180482d84a16e8…

MALICIOUS

PDF

100.0 KB Created: 2021-06-28 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 561ef46a1f9871ac8dc56474b79a0e72 SHA-1: 897f562a1f42d4dbfca6b66356c119e0d8e219ed SHA-256: ad180482d84a16e8dd94d735bc577733d1fd8e99c639ddbe064bcedf50ee3168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8d485320548a6a7e49849ccfdafe2c9c/12011031503.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427b27478---wenigegumagimobokip.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddd259d7ab---51574039169.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/49980634939.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5hosgu4bfh44re47r1j2mff6n5/41920964860.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/6605002536.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/41405168249.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988018d0ac4---43625133833.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608423616ff2a---tefuraludagizevema.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5a47394884c8f744b8e75f6fa1f51daf/fakibixureguf.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/rusiwekemizobepakozu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/22485979989.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e02918d2---6533689274.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4fda60b2f4ad35e993f9f62609f4ca41/jemorupina.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aafbb2b211d---nezifesupo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/12997148039.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/26513236349.pdfIn PDF document text
    • https://birotex.rs/images/files/18883950891.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l6b676lu1k96momtbt4607gca1/45382167253.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/nepefuxaj.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/xanelikadujoti.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pudas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cicerone+beer+server+test+answersPDF 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_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 10500 bytes
SHA-256: a2a95e6b1804331e4dfde0869cebc2d9b6bfd3b6b855135b4de4716828d4a38a
font_02_sfnt_off000155bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BF 17336 bytes
SHA-256: 6e6d7f11c2b5aaa9487cbd0eee1439768e1417460e2872911870248998246646

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