Malicious PDF — malware analysis report

Static analysis result for SHA-256 680a8960f12f9cc1…

MALICIOUS

PDF

78.9 KB Created: 2021-07-02 17:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3606a8cbde10b73412c46cd6a7b21a4 SHA-1: a3e2dc7b45ff32707124fb7ede36187872b2f9fe SHA-256: 680a8960f12f9cc168c45dd09aeb25aaa17d3641dd8141e768d641f347a00efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=i+wish+i+could+let+you+love+me
    • https://argekaucuk.com/nbg/upload/files/99636940293.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5a33957dc7353f98fb9519988a7f5366/tevimujog.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b227cb6b7d836c422969c8e60d83e48d/mofurodaponemo.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66a409ad4---54317496909.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070456f18958---lisoxesepawogasegujivaf.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/zaxeferokab.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e94ca477---661599344.pdf
    • http://aisef.org/uploads/userfiles/file/file/fumelojalasero.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c5485190d1c5ff01130daf2cc9e1069/39524169815.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/uosqv54orfrfpgubf0qujdaj16/wijile.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d911bcb4---15789873166.pdf
    • http://edu-family72.ru/content/images/uploads/file/mugiwagatafub.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f3630a2---52272305255.pdf
    • http://highendschmiede.de/highendfiles/file/puluputem.pdf
    • https://alshaabcoop.com/userfiles/file/64499349480.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8563df6---negevebidakurebe.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/edu95cfk9ugnmauqvheuupfvrb/rofasivowu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784cc61ad83---33724988891.pdf
    • https://bitree.ru/ckfinder/userfiles/files/71165133011.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/33e3bb0bb81a844e8bacec99b99edbc9/68398647024.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf18c5d6cc---96213859977.pdf
    • https://kuepancong.com/contents//files/wetifosuwiwele.pdf
    • https://gastriklandsbf.se/UserFiles/files/91957007534.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c943a13f306---44125520853.pdf
    • 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_off0000d195.bin
181ac5ecb88133b29b954c8eb56a923c3639c0e27cbba6e414351adee88635c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 17200 bytes
font_01_sfnt_off0000fdf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
font_02_sfnt_off00011610.bin
3c0cb298c4f5b7466888800546b27650bc9e55ebea4e91565f58133cc386cb68
pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 10584 bytes