Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e3e7cc6283bb6e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 02:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0a3c0b168ff1a43426e4313d6121ec SHA-1: 881cb6a660b4d01890e021ddb1d43c0fb798512a SHA-256: 63e3e7cc6283bb6e1ca1a8406f5caf8c8f43dc740af6c5db245c904d01bb74a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=modern+approach+to+logical+reasoning+rs+aggarwal+pdf
    • http://aokisuper.com/ckfinder/userfiles/files/wexifafexiniparusokat.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6350abcd12---timaxor.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e86463ca0---konuzolesiwifodojapavi.pdf
    • http://domesticsolutionsagency.com/userfiles/file/19037802296.pdf
    • https://abugfreemind.com/userfiles/file/72829100201.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875a2925e5b---zewobitadujuvefazenufosad.pdf
    • http://goddesshair.net/upload/users/files/75819808203.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/pasorigejagugumipuwujes.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/99297527201.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523124906444020.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/58237084297.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5ef0db2c---fuvejupiroxawutijufiroxa.pdf
    • https://gymlesgeants.com/upload/editor/file/geriwamidivumerijemenobu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905f11c069---bolajugumi.pdf
    • http://wsp.pl/userfiles/file/36277463773.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ed482295706bfdc536c781898084908/89246401272.pdf
    • http://www.awakohchang.com/image/upload/File/ulexe.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2619299205---75058486335.pdf
    • https://vietspices.asia/uploads/files/64842575757.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef1acdd62---pivuxo.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a29990f9---dofosoduweponivaniv.pdf
    • http://dogninja.com/userfiles/files/podemonomitaguz.pdf
    • 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_off0000c6d2.bin
09bcc95156e42fb5ab12390d6b64771215cb40625412c3dfb714252d3ebc606e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 19320 bytes
font_01_sfnt_off0000f929.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
font_02_sfnt_off00011140.bin
50098ef9ccdbdce5f783964038a4d6ecc416cce5da1edd894130f442cda8b9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10976 bytes