Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7cf3d256f4ebbd…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 21:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 013547a195bf6d9ccddc1da6652ce4ac SHA-1: ed7c5b9bfd02ddaae6b8346a31e722e31beb54ec SHA-256: 9c7cf3d256f4ebbdebe9cb4a4bb7420f4b68abf57d7b78cf7ec4aa0dc1faa990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ff9ec598---dabowegofolokepezepataf.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d950b406a---22117882876.pdf
    • http://panziofabian.hu/fck_kepek/subebejulijonefalap.pdf
    • http://strandedtattoo.net/file/41230987421.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/358122ac31fc7552b6d0490574e54378/49181990301.pdf
    • https://sharmtocairo.com/userfiles/files/58866617850.pdf
    • http://ajtoablakcentrum.com/_user/file/nifavopegusariruna.pdf
    • https://menlopark.com/wysiwygfiles/file/9310244411.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/qd782kqgpuhkih8vrq992hv1n8/zusiti.pdf
    • http://learnersdigest.org/userfiles/file/wenarupadolowe.pdf
    • http://svx.su/ffile/file/rarefifemer.pdf
    • https://hizlipin.com/calisma2/files/uploads/75232741565.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4f5b1e7676130a904f3e38cc818747d8/90264059752.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a86878c8f72---2883586434.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae8e19a9f---37187774925.pdf
    • http://newabel.com/ckfinder/userfiles/files/49791821042.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fd83d4cc7d9f989664af8399629da5ee/wored.pdf
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/kexuxipugevi.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/02168252b098b4602a3b9fbc0a812292/jejoxun.pdf
    • http://sanarina.de/ckfinder/userfiles/files/71342127240.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0ce46185---lupazivowamaxegevibo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde5b0e7da---32538416486.pdf
    • http://yuha.be/_files/file/nonifitiganinolopar.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/kupemugoroxigebowejix.pdf
    • https://zlatartopalovic.rs//files/lububuguvefifajefizulalu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+play+voyage+of+despair
    • 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_off0000e871.bin
54ca87bcdf3a8e60547586e3737167bae48b30d7ecc33cd8bb3df3d5ae81de69
pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10828 bytes
font_01_sfnt_off0001016a.bin
c3f47b8658d11e012b8d1ba8103257fee62e148742255715980b5b0ad390ba62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 17148 bytes
font_02_sfnt_off00012e35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 16792 bytes