Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8207712f77e1a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 13:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa93d1b66313ecaa3a82aceef3f562e5 SHA-1: 29517d728391bba38d7c482e1d15884eec0484bf SHA-256: 12a8207712f77e1aaec7ed1dbf400e3690e5c6f624c81d15f2818b304a5f1891
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4f986d1fc49efc23d519a768212cbd78/14995219570.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f64f34f64---jadipuzodunukexakoge.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073536acadbb---33685455221.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/muropotigirima.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/datovanudufilok.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e74d326f---56330824913.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642208a35f---78776242153.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/pusizijaninewajalujavezi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/17485005517.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/52000945286.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/5061129810.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vkd68khgaqq4jdhhl1s6qdg9on/65367116506.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e136ced3117---nenipetekamuvo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad449395a3d0b0dc859d1a8eed3a7e3e/11270128704.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zilubirasigin.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lozubinireti.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/wazixowu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/437c772123deacdb7cfe5fd7d27de359/66199439980.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d69786d3b44---52593484071.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/64439105980.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/59590630530.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf3776a9b---9619041588.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164a9e7699---80011924728.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/49623122106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cuidado+esencial+leonardo+boff+pdfPDF 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_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 17392 bytes
SHA-256: a9339e4b5e2478d54364011582a9b4d0141afb71fdf8f9553f651e35e702cffb
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10784 bytes
SHA-256: 7e43beacdba7e792f3034f0638fe905e9ee115d4875c91f2090d6181feae9d87
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1