Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13c572d2589778d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 04:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34703868c84cc8370a2e9f4083f24f5c SHA-1: 20d634f7f3e596fc24e4ebf90b86efd28be6857c SHA-256: a13c572d2589778d6ef151a150414062b1c80073c874c85cd8a27bd599bcfd23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d658f2dec5---70212905828.pdf
    • https://seeandhearbetter.ie/img/shop/contents/92244833183.pdf
    • http://lnianemarzenie.pl/userfiles/file/gixoxuvunasupikemebiro.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f89dc4f8---somenekase.pdf
    • http://hotelgiottotorino.com/userfiles/files/movowimudijuperijaku.pdf
    • http://inggeo.eu/userfiles/files/1837575658.pdf
    • http://salt17.com/userfiles/files/ketimuluxadizixesus.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163155404849.pdf
    • http://chugguwang.com/files/fckeditor/file/83587623241.pdf
    • https://peintures-descours.fr/fichier/files/wanofav.pdf
    • https://dlt-nkp.com/fileupload/file/nupitofefefex.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/58945494470.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/29648807645.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/106292ac20fb466b1fc765f22e491a38/rugalibotovigazolovizisiv.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/gisaloxiz.pdf
    • http://medica-eg.com/userfiles/file/kutifopuwuret.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5139d63f---xekegemanereli.pdf
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913195557998596.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325171cd1d9---zugiterunijetanukik.pdf
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdf
    • https://flavio-tonon.it/public/file/71004392186.pdf
    • http://mrhobbscoffee.com/images/uploads/file/19344336044.pdf
    • http://lor-rostov.su/userfiles/files/1143089190.pdf
    • http://urbanelect.com/userfiles/file/rakenikuzoxinunevijer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=set+a+video+as+lock+screen
    • 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_off0000bead.bin
1cad33479f9bdfc625f15d8e9d60dfd59b71f1f3c4c077731b87ba6433018a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 16352 bytes
font_01_sfnt_off0000e920.bin
dc5cc4599b69023aa6de90ae5e28351ec7ef9e5456fb16cadd8bb4572836bc9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 10596 bytes
font_02_sfnt_off00010177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 16792 bytes