Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c5519620845459…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 21:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb653473cf7ee7b28f2005a606588689 SHA-1: 1140c4a63fdcb774d5d8b6ce32ae5c81a29ef96d SHA-256: 44c5519620845459420fbf2e1f3c040d29555752420c43afa6ad449ff13778f8
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics strongly suggest it's a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

Heuristics 5

  • 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
  • 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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3f1288b7---79690156588.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3f85d891---pogotuwobebazafimipivi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/girubamovuva.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/uvp77ioh20v190n9h4sd2u528g/fijoponikawofi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/geketexelekodoxewow.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/15791426375.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/36090321887.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6jtdbo03t9714n54pq78cpvjs5/wobos.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4be1c95f54c1513c21ec0cb7e5431e19/51241840786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1884370908---valekutuguwizu.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/82688915458.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9db5c73d6cb4d1d636f4d552140719a5/ditefezibe.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qe97ecu3tsndvdv6fdjvh2mk9t/ludevakasajexedovi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d645db674---57760995198.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/qm0p9538gs75uko1kvgajckg9t/40591000120.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbf948856---5408494099.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06cc5ea5e6---puxasizalanubazaper.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/52333120082.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/faxitujegejagekux.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9099aa0728b3b96229c0bb274fb15150/92766418401.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620882907.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s01e3nnnfairga1kppl5dh21n3/jemopowopejiwawoz.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/texireduged.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a91318287---nudorusiga.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/99401884969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=all+about+chow+chowsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 10204 bytes
SHA-256: 3f66b70b3e3de9b4d56626294c32ba64776289d4d26cb3f75a82225f2fece25d
font_01_sfnt_off000144ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AD 17460 bytes
SHA-256: 02b6724c71060b8634419e4190b2a59d17e4b3fa6297e584659eb715b4db46b7