Malicious PDF — malware analysis report

Static analysis result for SHA-256 9350e48b4cdc6e37…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbcc71b0b82ef5a1ef80ddac1c738346 SHA-1: e0ff067df39e59b28e2ab6ecc62983324a6b1c24 SHA-256: 9350e48b4cdc6e37a146710db914f99d09d5ee7f18a6a9eaee789e402194358a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613148b88aadf---noxotojaluxabokaka.pdf
    • http://brandnewgoods.net/userfiles/file/2341950360.pdf
    • http://www.allatpatikapecs.hu/images/file/zegojapirovudoxipumod.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609833e4d385b---ripejipurevofeloxezupa.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/6sg8oa9msgg2obni76gh22mnmq/vawidulobelozapagenut.pdf
    • http://doubler-son-capital.com/photos/files/fafebisa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/79a1a0598750de4154d9ec8ec8636d0e/rabomibixed.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/57744381937.pdf
    • http://lawfirm.vn/MINH/user_files/file/fusesavusewanejo.pdf
    • https://bem-sa.com/img/file/wonifakazikamem.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d016115570a75c643216939e2d57887e/87111792838.pdf
    • http://bitite.lv/media/txt/122/file/mosikawejilesi.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd3e2086a---jejipipozexel.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481f21e43c---junojas.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9230432308.pdf
    • http://eventechsite.com/files/files/jovorefo.pdf
    • http://jatechkj.pl/upload/fck/file/80938374900.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/mufab.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jas90ht0j4fo9368kjtrbt7l80/negijo.pdf
    • http://clubchic.lv/c/i/files/88496612408.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3f687a84ae25d00716924acb2b4848da/meribonadidimudef.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98ebe10444---5942440404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=helping+verb+worksheets+for+grade+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34e.bin
8f791497232841318a12e6ae9476d7c43399b31e2782f95ea6c888eeda074904
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 11272 bytes
font_01_sfnt_off0000fd57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 16792 bytes
font_02_sfnt_off00011569.bin
61dde993de321d79315004dd2916fb084297bc1f796380fd3790f53cc8d9a810
pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 19204 bytes