Malicious PDF — malware analysis report

Static analysis result for SHA-256 417e5ba9ae3e9cb3…

MALICIOUS

PDF

75.3 KB Created: 2021-06-14 08:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5ffe21e625028b96b327bc368a84d554 SHA-1: e58fdf8232a9afca32fcd091f73cd4b2ebcb1701 SHA-256: 417e5ba9ae3e9cb3a6a3ccf0dc868796bd79a92e545cc06363551ae85b73462b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised domains and external URIs is sufficient evidence of a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://wastran.ru/uplcv?utm_term=queen+azaka+songs PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994fd471c2---jinezitimuxefunonidenako.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5d33e962ddc6bb784a6478d5528944f2/27726397609.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ga5qv5gr7meih65c51d12hi70p/7517388056.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508d90d5f8---rezazuwo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2adeb6f7a756016c1a30eb0177b87ad3/dasakimuxirozezajidele.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607387f7dbec9---bupadurovatezi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/566f5f7dcce626a27606f6a93a1625c9/72915080632.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c092b2b60af---naroxutofanilofamogeme.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40445aeb02---momewelizegadatap.pdfIn PDF document text
    • https://majubesar.info/contents//files/35828793408.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/dujakekeluxazavo.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/66719172778.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/rizeziviwifabedawafaxuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 4900 bytes
SHA-256: 0a692607354ae99acab0a8865aae00a575ef8d02ef0e01a71b8bdc31bd32b10c
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 13052 bytes
SHA-256: b4aa8d3ba65141a261ece35a9351aa4250e26b27699193a7e810255001e97309
font_02_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 17684 bytes
SHA-256: f7fe7fe72b0da44dc467ee7b5e8a81c0954537ecf6f1e5b9115b6072f1372d63