Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc1d087a241046d…

MALICIOUS

PDF

75.5 KB Created: 2021-05-27 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4e38339fea38bc10f85f03bf51a3acf SHA-1: b117e795ab879cc59f6698aebdfb4d02421ebfe6 SHA-256: adc1d087a241046dcb3ad462e82d86ab1810b22a7baa1f3ca17a30632c2ae56e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9498

Heuristics 5

  • 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
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3098103c7fbe865b4a360b43f25e3b9/nepavuzikixodaso.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c177fed9---52640926796.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/ledezasefedonufame.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0001be71f1---58256380980.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/bd4ma8p4lfgl4quuu9o1qsb5u9/70443475211.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/57040768705.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3cae9112---42324315684.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a5fcd85f---2711868213.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c13781aa---gutituxenufusamegadabotef.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ebome4nieo5h2c5q21t2i1bh9t/mudinenusoxabadezebov.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15846346642.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/69426639083.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d268c6c---soxevawebimajoki.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ep15pa05bs8p2d8m9fakooreom/8755879529.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/87451493054.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a81ed7cf71fa716938069203affca723/24991246376.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608459478629f---72385814719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=serial+para+easeus+data+recovery+wizard+full+mega+2019+espa%25C3%25B1olPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 6576 bytes
SHA-256: a46936756d6d09fb2dbc2f7bb3f5b5c420622404d4cb6729db607309c39d364c
font_02_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 2472 bytes
SHA-256: 148088654a7e042e8a6f345d7e2d1633dfea31accb6444ec941e1914bb9a7568
font_03_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 11616 bytes
SHA-256: 967b249472136179b3b32de75b7c9b0156a93a4a7a6e36f7139e60bfc6fe2672