Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbbe573f273bf4a…

MALICIOUS

PDF

98.7 KB Created: 2021-07-18 20:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16fe4063503cbbedd2f42692d1104097 SHA-1: fc114955cc089de292e76a3f70bda5fa9d710ed9 SHA-256: dcbbe573f273bf4a9522c96817ae984c7a04fa8e890e9fd941369c9dc88298b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which are likely used to distribute further malicious content or phish for credentials. The document body is unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hqqser0utnvge2nt66bvdatq42/sozisepuvudewo.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608898691a4b4---pulipemopuz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38020dd3f3---natakaduxuk.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vidavopozavobe.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/61423851c9850c6a7946dc4ae5fe1c80/16468271148.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/kejebuvasox.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/67754455041.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/50247282146.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nixilazobakorewis.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a3d82877b41c310243985438c506f105/39838305695.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/92p48thbed3j1oblgrgf5fcqs1/68205904603.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/96836532126.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ca049e81---78666074444.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/bibewonotesemisufowif.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/semibuk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b3fe6975282e217ad0789c4560dfdebd/tapenodow.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/88e7dbdfb1262d43fc6cd444779250c2/fuzatogapixadixazuvib.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/27375554409.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/23606172121.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/legulixupenemipanurutef.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947393da964---97861421151.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35dfca958---35277661098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chase+from+bachelorettePDF 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_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 17664 bytes
SHA-256: 095710b739dabc29167cfca872d1e8bdc192e4eaf47e423006aa7c400fbb0141
font_01_sfnt_off00014d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D90 10576 bytes
SHA-256: bc40e34fef26ddd3a51fcac62fa77df4f5a47087976f762dc46ef1fbcdea5ef7
font_02_sfnt_off000165ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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