Malicious PDF — malware analysis report

Static analysis result for SHA-256 068ef5512a59b514…

MALICIOUS

PDF

88.4 KB Created: 2021-07-19 14:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dde789b0bb53d7ed632d22d21555d253 SHA-1: 09fc398b83c63d54e13cfcf6335a918a48dc13ff SHA-256: 068ef5512a59b514215a46e2e285427b66cad79c30763144d37ad36bacbe2e91
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://consulcongress.it/uploads/assets/file/44688027768.pdf In PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/gogil.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/olno8ndl4j1uv2jg4ujck323ga/malode.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eabaac37d88a032b827996a2663f253d/76514608020.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/bodotatetibokubewukarege.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/nebevixo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b6143a65---girakiworovorivamoto.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/leduxorusaxelufu.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/78421557196.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uok9ecpgualbq0nmm068a6jir5/gomona.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d04387d322e42a277d770a3961901a52/1925178993.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/36199970386.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/92319248651.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfab91662---67858925901.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b745b11de0f---74552202842.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0538b0beffea1a6d202071058b873e9a/11831584078.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/bizakopavedaweremuguz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9e69db97---54130803557.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2iajet67kq838qvm0qo32ro6v/peziwawarimafifasezoruv.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160795948d65cf---rimojorefepa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa0040e31---98382578708.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/6651423055.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/zosigikutawijegitosazu.pdfIn PDF document text
    • http://veivel.com/userfiles/file/forubesufaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=do+present+perfect+simplePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 18372 bytes
SHA-256: add820d4e62ab43bd57be49e3ecbc199a0345ae937df54b012b7f138fecfa1b0
font_02_sfnt_off00013af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF4 10480 bytes
SHA-256: 8cf76406e9ceddc894853c4a52478c683d1a21465580b24e53afc22d17f8d76b

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