Malicious PDF — malware analysis report

Static analysis result for SHA-256 695c91b6f7b96fc0…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 05:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce7293a5db13873a00b05a9e96bac9cc SHA-1: 9d6f8857b32567a4455095802233e699a9974bd5 SHA-256: 695c91b6f7b96fc01b091ec84b082b76144b46e1f572fe3b44407522906b6b6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=thermolec+duct+heater+manual PDF link annotation
    • https://retrofitoman.com/ckfinder/userfiles/files/17330006300.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/12449ce41ce506866ebbfe54c07afb7d/rugeledixuwet.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sabekeripu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89661341171.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/foden.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/77301118221.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/rusirogutuwogenulaxep.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/71340140354.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9b73f70df636465c072bf2474a2474c8/gusimuduzegokogope.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083994490a3d---72559119230.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/dazufisedewajokomavizob.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/73980950390.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/47422112791.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/torederegub.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/36592792370.pdfIn PDF document text
    • https://afayl.com/userfiles/file/xavezoxudetukamowureb.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f2030256ba3---26520110673.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1729c21802187714f35468a29be162e7/jiwupoxelonixuto.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c52bf725f10a03ee41af05ea01d42253/99246007890.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/14067810005.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd045cf6b5---88976042783.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/3584402585.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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 17812 bytes
SHA-256: 0cc0a4408edd452aff46692b062cf96ad80a99c38e05f9c41ca0712800ad8de2
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10436 bytes
SHA-256: 6211fa08950a7d7e319d5a5a20c073192fee3c8396037900f5a68c9c7021e753
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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