Malicious PDF — malware analysis report

Static analysis result for SHA-256 796d947f434bdc8b…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 05:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6301d6ed9aefa6b9300ccb09a9ac1843 SHA-1: 83fd891089cda6dff6038059a98bf0785bbcbfdf SHA-256: 796d947f434bdc8b35729cded7503a4b717378402a76fcaa039062939f4bd040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many on disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fea51b36---65950287003.pdf In PDF document text
    • https://ebooksweb.net/files/file/81996263766.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dinovirutoloxi.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/58725722174.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fofomewisavuf.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8ffc0420c8d4ff94b5a66e65a8555644/78947073302.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03d81f995---jewosiwulojenonuzolulo.pdfIn PDF document text
    • http://slsnn.ru/content/file/notak.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de04b38c7b92d1e95645f6e5e32671ee/diruna.pdfIn PDF document text
    • http://sns.hu/_user/file/26735186118.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/38b7f830098fe3a6ac7363c2a55def91/63004047099.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s1njd8rt1u1tl6va2d0dmu2vi7/59422380744.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tepefabedanegize.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074c064de67e---92491465223.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/32c2ead9380a502ce33b1d15fbdf83d9/81526030447.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0e3dfb5d8c918e4dc44d08bd65043b4d/57383480941.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zojagukumetetimokok.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a70c95c23c41d595dd428dc213ff6215/vefiroxokiguzerasera.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/835df8f040ca383586b358b9a406303d/gojefibedawa.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/917ff2d5ca2a024157e59f031f482c81/todaze.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/47ca22a19e48c51dd0ddfd975b2f71a5/vakipu.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/9632556006.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/ferifujutifulomeraperob.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/70189700704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+human+network+pdfPDF 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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16828 bytes
SHA-256: e95af70450fa80b45c19337c5ccfc192e03d5e4d086f28826267a5e9acc2059e
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 10696 bytes
SHA-256: 2e107ae0f270fad3d96142b7f3a0a31413401df8436c12651a639a2682592d57

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