Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff40c74f862e9947…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 05:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32f5a0f39c55a0280c6cdc1330e1bbf8 SHA-1: 8301ac345961533ba476506a75a8d1a08b17df70 SHA-256: ff40c74f862e9947d8587bf7d8f633941e22465c511622d94c57e4ba8756a2d2
172 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=3rd+standard+science+book+pdf PDF link annotation
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/8723874373.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fegik.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/12181663040.pdfIn PDF document text
    • https://kaparatt.com/images/File/75365229597.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xogomad.pdfIn PDF document text
    • https://petikdaun.com/contents/files/71320283487.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/30011366785.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vunikafenowigukavar.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145f3860027b---ginibupifelozesefaw.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/83157484947.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zorezubu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_B5BAF1BD0303FC94.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/20090396911.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/90249845566.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109092032174200.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/12710930423.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/sikilalogivuwop.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/mogemaxizetevujizugoludu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493ac514384---golivofowig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceeeafd28---8414348933.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/duwaku.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/tanaveduxidodatuzi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7197fd06---91690384145.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/gipetofemelepad.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zisuvekigovimevu.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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10872 bytes
SHA-256: 44f4ebb78ad743effa05f528580466acf11b823cd13a527f967fd256ddc880b4
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 17988 bytes
SHA-256: 502d1cde6719e41bf2754ff1d14190f1f973b94a4264a91cf141b7fd0d49abf6
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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