Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb837cea923fba…

MALICIOUS

PDF

85.6 KB Created: 2021-07-22 02:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb65c086d3e4bb04d2d59d7f0840f5b SHA-1: b56ccac613f61434c081b4bf339e9433cfba7ee1 SHA-256: 9fdb837cea923fba4cd438008fcb9119d0ac8beb1dfb26c097f8946dfb4f9a68
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 sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised URLs. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/13b81109992ac704d0f3dbaa145e429e/75802703922.pdf In PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/degidevuwoxododulufosovaf.pdfIn PDF document text
    • https://rasorestefano.it/file/bawinu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d9717d2b507b82fa1ed382e815d91f2b/lavikumorowak.pdfIn PDF document text
    • https://fallsplat.se/file/32797164864.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210702090913.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734793916f---raxifevezizosunove.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516194627.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/zutorufaverikilonifabag.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4a7785b64ce35ebe7c5b194f0789c1a9/51617794426.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/15689870423.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/73546050725.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/25440967304.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/30232967666.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f907a789aabb4dd6862edb5cd3edd88/50064363575.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6671507383---wawufu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071994caee86---memor.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3893293637bfd9ab513d7e641baf9365/zuvowade.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d7faf74b31402ab66b627fe1eeb21656/durifutekavi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/temesedarobezegaj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/39873779104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=substitution+reaction+of+square+planar+complexesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/569306aa715dcbc4dd251b26460fe2a4/pinuwefuviga.pdfIn PDF document text
    • 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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 16960 bytes
SHA-256: 2d75fa466cb200561e37a2c8c119871734faebdc9e8f99be4dde4660823b96e3
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 11204 bytes
SHA-256: c1a6ac64e13e5ee42f518fae96a39813a5ebd5d64abecde625dc37f3b3afb2f8
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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