Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab78883ece8395c5…

MALICIOUS

PDF

102.5 KB Created: 2021-10-10 22:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 207806738514dbc5022c1f6575928adb SHA-1: fed4b7d50fc33cd4b02971dddf79ea15bad8affa SHA-256: ab78883ece8395c59fa5c9ca25543dbd40834881d6c3986a975de47e1f4f2c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d02f029e585da029617eb84de22f0b5f/jadamimabekaladogix.pdf In PDF document text
    • http://gocoachfox.com/userfiles/file/97461126854.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/donuja.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/pewudorupup.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/38606364096.pdfIn PDF document text
    • http://belloverde.net/emailer/file/gunapelazuxijazemofavixo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kowuxiguwumatuximaduj.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/597351252.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/tudaxazaripomopozixak.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/14434038704.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab9e50630---78432684974.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/sanuvojexu.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/53500940924.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/94645214886.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/24962270329.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/16151533093.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553cd1a24f---37102646191.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c7dfc24eed2cff5cc031b140deab59c6/merewevapegixo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/38287918385.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/musisuvi.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/67868709678.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/gigugabafigigumiga.pdfIn PDF document text
    • http://bankerz.in/qpic/files/64610509408.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vagovagedero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=technical+drafting+grade+9PDF 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_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 10600 bytes
SHA-256: fc50d33e97c8d33c76add59f49ffcaa3b6855eb4e0ee368ce27420a35c5cefd4
font_01_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 20188 bytes
SHA-256: 8fe2d5f68ea47e0ff74da998d5ffbf3820cf2ea6522bc55118c4a107e232c684
font_02_sfnt_off0001740a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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