Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3809a6c7a0b210…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 09:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c93bd1fc71e85d7f4badd451c7d950d9 SHA-1: 79489a1e882b5f6acf0113188074d70367aecad3 SHA-256: 7b3809a6c7a0b21040807fa9932590e8f9b1d6706a5785a8ff00fcd9aec88c8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9eed9c338---kinogoweg.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0bdd4bbfa0ff6a9083adb5779c245fb2/xexilixirajixiwatenurore.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/dab70edc46a1eeb35a966a8343093e2b/rofotolaxupofo.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210630134642.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/87badf15a4a54e9d46897b85f9ac0027/kafebevawigunefawepepare.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ea043421abaf8f1121ba4fbbce1b14e6/fubuwa.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fcfe3f9f758eaffffe73683760bc2011/29236016647.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608915a9bd6c5---porosanata.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d03a127c---zekogefereteke.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/29cb511db145d3b16c836909bd21188f/dusituxalozafeg.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bf73c485---88292343249.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087003075de4---32490555301.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072799e52146---mawir.pdf
    • http://magooferta.pl/uploads/fck/file/tedowo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab070c2e8---11207330499.pdf
    • https://mimpishio1bet.net/contents//files/70380363723.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4u0mge68n8grc8q5r03c4aibjr/buwusenifikupugifubezigub.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37876a000---37599498632.pdf
    • https://smilepaper.tw/archive/upload/files/wonewanexikonikap.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f85ea9c51---37714741756.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/vupujamojuwubikow.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmdimolsv5caet954rm9r599r6/85985052478.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=being+grateful+for
    • 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_off0000e684.bin
40affcdd68c41d2b9d69fa2601df8bbbb6fbe2db17749a02f24ae037b80f90c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10376 bytes
font_01_sfnt_off0000fe1b.bin
ae74c16336c4a83260b3fffe5884c5d60742ac09efcaeb1212acc79ac9b97ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16900 bytes
font_02_sfnt_off0001298d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes

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