Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8231fea15aded69…

MALICIOUS

PDF

79.5 KB Created: 2021-06-27 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9beb17bb6e05aa42053866835a561f00 SHA-1: 2d83a47bef72204e9165c89293554fe3cd8e98f0 SHA-256: f8231fea15aded69884b3624ce054610bf2a7b7b39abc7b4bff2940b6e81e914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f2a5b8b---32497547724.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/91b3093af551b79c6f3568b29053bfb3/1255490698.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/mefidagibufi.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07ac33c70---24535064316.pdf
    • https://dbmotorbrokers.com/userfiles/file/36150437185.pdf
    • https://autosaloncenter.com/uploads/file/nemoperek.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9c2542ea---worujomajeveta.pdf
    • http://charivne.info/images/file/buwat.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/pokipupejuvumarozot.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834da7d0d1---13776867454.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qff6m496l28vnamie1i377tfg4/tosazewijan.pdf
    • http://lezeckastenakosice.sk/upload/files/patoxebejujirepunegi.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771fb216996---zasorezux.pdf
    • http://megalabsrl.it/userfiles/files/85545181918.pdf
    • http://abwferrellpkwy.com/uploads/files/70570554744.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d33e8232cef---88385615671.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/409f197a2c1181b9b07f19ba884c905e/92006182037.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b57de5f2b---lovulukafawoxu.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/149a3d046d6ff3c6b308bcd46d2a598e/2661523144.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec595c3ea3---61775950346.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/iut7a630nq2p89tma4a1biel31/zosanadebuxamodut.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a59095bd3---xugumexiwedojazelurajo.pdf
    • https://deniz-sogutma.org/img/userfiles/file/lofidapid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=commodity+prices+in+international+market
    • 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_off0000d32b.bin
8e664c32d7fadc6537c1fb0a34d8dadb00f785d854434f7efec6cc074cb281bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 16904 bytes
font_01_sfnt_off0000ff7c.bin
b55451e05c8643597b3f2d3480b8510a419b651c4250574a4906c7f2bd3e4ec4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10912 bytes
font_02_sfnt_off000118ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes