Malicious PDF — malware analysis report

Static analysis result for SHA-256 e682d63f206aa7e1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 08:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 554b89bb04ec22eca0bd96da599d5108 SHA-1: 4f76cc351ff492d4935c3da500aa65e6f9cbdc1c SHA-256: e682d63f206aa7e1e3e9a35e8bdb674ab9aa7f349abe035d096e45453eac1082
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure of the PDF itself is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://napraforgohotel.hu/upload/file/mikarutufuzifitugoga.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee73a6b20c---83680306031.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/24b282e0f9d202366f020442e778d25b/996973729.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91494791473.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088741edd22b---lokosav.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/73596547478.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/55462123306.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2f5c68c09263ba88d248e16f39a58138/40789778720.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/vatexo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/21946972799.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/35001790122.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/15829355415.pdfIn PDF document text
    • http://geodez.com/pliki/file/mesunilefusiw.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/13954972807.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/bikelosuginifulunibuka.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/giluwavuxaxoko.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/mevazovixuj.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff80a6f499---93180278937.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/30874142295.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcb95d541---kukasepawuvabupebof.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/tazafamevodetizesojebi.pdfIn PDF document text
    • https://tepihtrava.rs//files/wegonifivino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hermann+hesse+stufen+pdfPDF 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_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 10596 bytes
SHA-256: a692fe661fe9c3d424b97fa3fa6d6c5f6af64c6b8854f7278cedf7e377d0c178
font_02_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 17668 bytes
SHA-256: ba155ce41c53ed06e2af513216b040c2219b2d2d188ac4934aa5111eeb703e46

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