Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf6da908f4e242c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 22:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 720677e0431438772863609b2e32603e SHA-1: aaebcfa96deb9719d03839830a7863e26288e1f8 SHA-256: 0cf6da908f4e242c15bf455655644a746c2bdc0590adf3f3770001272bcf12d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which are characteristic of link farms used to distribute malicious content or conduct phishing campaigns. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/877ebb87c8836411bd48e21e7f0e601d/dukulenuxasip.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa38c3e1f7---sutuwojabutemitolixanojad.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f00e59f4ad63cd3a07dfcced242e8f70/zojadineriwijidugevutuj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cad0ab5ebff---61184422818.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/85606363439.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/68789151622.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076127f17185---larokeparujazepariliwoke.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/joxamafakezobavimuk.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/zowodabupemufujuzemanim.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/xazijeri.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/razejopamode.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/77880980159.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/3499259158.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kah5f1qrt52ap0sgrah7uohk6s/22216534256.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094612fcb6f0---maxixo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161219288f0abf---vitigoruxamoxorufowowat.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/romizogoka.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/30081396017.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27c7de682---sazalapovabobipemebetar.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5490bd626a---15362900606.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6ee61556---jobanozed.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/86796582826.pdfIn PDF document text
    • https://wrd13.com/force/file/tugofibamezeduta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lime+substitute+in+salsaPDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10244 bytes
SHA-256: b268863d5d0ccd0f98a7dce0aa9d98b19991344a094becf10410207a33be74ae
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 17396 bytes
SHA-256: acacf9733903d95237c895636fbfec3c8b6039a79c900f169b13eba3e1407662
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1