Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2dc6e34947f984…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 20:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ea3c4ec4e1d9aa58d1f33f5a79b94cc SHA-1: e132240a80bbd39f76e4cff5e9505b5affaf1b41 SHA-256: fd2dc6e34947f98449bf18a8e167f9b9a0c351bb10191ac6e3bf5ed384f446c1
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic, suggesting it prompts users to call a phone number. Additionally, it contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, which are often used to host malicious content or redirect users to phishing pages. The presence of these elements strongly suggests the document is designed to deceive users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=how+to+delete+an+app+from+my+android+phone PDF link annotation
    • http://retailpark.bg/uploads/wysiwyg/files/78331259046.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/futoxudigepe.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210904211722.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/bivel.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/pomojir.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/73237673109.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/80969276136.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/88099670066.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d87602d0d---bevadulogetofe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613115dd3d092---48578739778.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zuduni.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/popanomimunarefu.pdfIn PDF document text
    • http://domario.ru/userfiles/file/21938923525.pdfIn PDF document text
    • https://0900107678.com/upload/file/30591376462.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/58116396065.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/58575487682.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210917_549CEF8BB1501932.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/ramoridara.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kivesiketuteto.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/vofafituxuvawiru.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/57286641409.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0789b241d25e423b0a6eee9e2f466ae5/63108199007.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/foxufanekizigozidiluven.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 10788 bytes
SHA-256: 3a82935565ac267ee6bc6da23cef01ba30de068c5eb433c67ef748fb15903541
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 17732 bytes
SHA-256: 94753a671a2beb68d3856db0b3d77382ac3f44bd02f71424df168a8f829850fd
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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