Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a55a2e3d07d99f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 10:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdf400d76e0f75adca57744e3344e6d5 SHA-1: 7e4fb6480e16fa8e036ae9283ccb879bbe3158e4 SHA-256: e7a55a2e3d07d99f8868ee9271903e9c6ad84fbe94b2a2ff26bfa24fb2263bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The heuristics indicate the PDF is structured as a link farm, with many distinct hosts and links, some of which are on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://newo.ru/files/files/29631910928.pdf In PDF document text
    • http://brickform.cz/obrazky/files/fesigatat.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zamitezadoxetilobor.pdfIn PDF document text
    • https://novsport.com/content/File/jigelobobofelaso.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5cp52fnc01l6fna7lsh0vmo2gl/xifenoxizisagawosobanesi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/vg9iun00gmfkqf0lf0s42ajpcv/911467907.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/6474008574.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/98b4077f00aef2e74f58fc979984c74e/razozab.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ec4f88da79b42502457d9a440ef8dfa1/perarisekonax.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/43538438257.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc315b1547---rorun.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69832545802.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/pedafepugibomewe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dc03f46c2ca2317fd3de8686077dde02/kulopubikujuferazopajuji.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889e6bd608---22703091030.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/buzokolixanezifu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f06750d1f7f11c5c106dd76831afafa9/67578884753.pdfIn PDF document text
    • http://wawa757.com/uploads/files/tanetaxobubujifimatuse.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/goboreva.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/51507037565.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/919e80bc37063fa867b28580325d36bb/wodunixugidobumuneginiw.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/rufiresijox.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69ada6d03---wopele.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345c427124f---56796026290.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210708215356.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/31116730596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=french+revolution+pdf+slidesPDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 18340 bytes
SHA-256: dc9953c31f4c2b5618e8f68d42581f34cf253e6a986ff5f760aa818e8f5435a3
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 10700 bytes
SHA-256: 8dae9d52f65cbeb4c9891505d7351aee7a4c93d976f939b4ad98acd19349b1ba