Malicious PDF — malware analysis report

Static analysis result for SHA-256 5651b3ab7d9aba97…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 12:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d37812921d2aa0d185da65f23bd9220b SHA-1: 83ef7c301fb8c1bd18e499d105b53e53bd06f0ed SHA-256: 5651b3ab7d9aba973ef125d647fbf7377ea39c7a04f95e734f6872b2b2429464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bannhuaduong.net/upload/files/kogomuleponofexapudaxifix.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e49506b4bd9fb427aa05c3f294601eb/95441395562.pdf
    • http://king-pro.com/userfiles/files/498621739.pdf
    • http://www.aportecnica.com/imagenes/editor/file/84471668610.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s3af1l7l45063dcft3jd6l1ou5/36273896901.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087759bb4177---85488229147.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jo8qspuj29kvi40sntim6k56b1/22686668727.pdf
    • http://driver-jazda.pl/upload/file/67122269263.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/31b6b2036eb83d1800f5df9e4f0bea43/29889626269.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c449809---69800046416.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/csfjdrn1rf7c5crs7fopnrnu1s/6733683577.pdf
    • http://inezorviskids.com/clients/37546/File/vowonemeseg.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810f6db830e---kasagawe.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fea29835d---64613412732.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af974c0b99d---51025135557.pdf
    • https://yukkumpulgroup1.com/contents//files/51071177444.pdf
    • https://theatresaucinema.fr/uploads/file/xopufomegem.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/089e650a6e8bc39cc83ba8e4c03df2d1/14942228912.pdf
    • http://renovfab-menuiserie.com/userfiles/file/32759884323.pdf
    • http://eltonltd.ru/sites/default/files/uploads/vobeketukixe.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1ae35c20f020ca1cca644c5ff9d5a508/65457743088.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/386019eda6638ac12764e13ee9864b7a/batinamozumomapekosuz.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/57289801814.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c186a3c6d2---refuriwobajotuzewod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mother+of+thousands+care
    • 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_off0000ff03.bin
37e626f934b2ac6df22b1bcd0f2a9cc817b4cb17dba5d5f4bec90bded1482ede
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 16864 bytes
font_01_sfnt_off00012a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
font_02_sfnt_off00014286.bin
48d9a84072610d5746a71b3894995cf64674c99b130d7b3dc1b01c69525a1fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 10528 bytes