Malicious PDF — malware analysis report

Static analysis result for SHA-256 c851cf2e32c5d945…

MALICIOUS

PDF

84.9 KB Created: 2021-08-01 00:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be81c6a5ce2dfb83161d327106aa4b44 SHA-1: b1f2e94e815546fd31ee6258377c56761f72b531 SHA-256: c851cf2e32c5d945757bbdace45185a8a139becc99c2b0ab82d785df6c1370f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://orbitsecurity.qa/pro_mvp_tech/uploads/file/77590080834.pdf In PDF document text
    • https://bloomland.com/sites/bloomland.com/files/49346937848.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a75c92cd5b337683f6f090b892df14a7/23768942627.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0llnckc1puc57l60l6u62tucj0/dodifodusoregefepe.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/474d9d7c439d9ff9d0368b4853afea5b/37684425306.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/90916551202.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/joladenipenelak.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/64567764870.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b9d9ca7e16ec1d45bef87f51e835324/3370412775.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kanimijaxenep.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/waxikolapam.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/46549758908.pdfIn PDF document text
    • https://flyags.com/editorResources/file///81883863879.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/1739482866.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/79688483446.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kugolam.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de47784b6---topabutifuvumejep.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6729e96---xodulori.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/14067395768.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ca47224fe5e---lanerevu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77btjvnjrespp932e1lci15l33/kisaxowoje.pdfIn PDF document text
    • http://ezibra.pl/upload//file/sabosan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=passe+compose+avec+etre+ou+avoir+exercices+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 18872 bytes
SHA-256: ff74ea014c67a89c2c3528de2c3f55b4c96dfce703f0606614de4b736aea16f4
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10900 bytes
SHA-256: c0c23b6a597370f5c5f754adcdbbf7e74c86fedd6eaeb71430eea9074d8aa20b
font_02_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 16656 bytes
SHA-256: 897e89934aa722d32284c5d49ebaa49ebf3ccadf86c82f93622591929a5f2634

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