Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bc290bce830b3e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-09 00:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dc517bfbb198554541206f2f2556cc8 SHA-1: d4212da29be175cd862b00803820cd8ef88a09fb SHA-256: 44bc290bce830b3e52f0c44936e903b659e87e35824421a2dd88997e91e0ae45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's designed to lure users to malicious content. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huabulaw.com/uploadpic/2021-9/file/2021090900354073499.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613052cd7de82---31278907489.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nikopazolo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f279e1eebc---71797156853.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905000610.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/monujodasewurekodinasufap.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kunipifozid.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xawaniguxedijinezawad.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/66990042969.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/rijakosawabez.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/85438515762.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/37b7f47f51331446502683fa136a85a3/38620021051.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c49pq7kkpq6lnh2ese7v6fp0qd/86887105637.pdfIn PDF document text
    • https://expomediainc.com/upload/file/wikelovesererabel.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/59226032613.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/xakirabatuwovubuwek.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/wituvex.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gomipixukunenipajozanejot.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/66916570986.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/34481810447.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/48706226469.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/vapagaroke.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/76291995605.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bb4064313ac16c0d4f03b86037fa1a09/42004183020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+mod+for+iosPDF 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_off0000b0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 15040 bytes
SHA-256: b65d8315e98632c2e91889d92c3b1390fcaf95c712742a7ac2173f2bbb4e5f01
font_01_sfnt_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10540 bytes
SHA-256: bfd8e6bce1c5dd9454a69569033d0a73e6fd13536c7f3dbdda596f033834ebd0

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