Malicious PDF — malware analysis report

Static analysis result for SHA-256 4710f8ff3fc51de0…

MALICIOUS

PDF

112.3 KB Created: 2021-07-14 07:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cabcbbbdcd1c89c2e7e8ab67f43e465c SHA-1: e3269450ed0f79cd72ee9ba0c86768559f9c0cc3 SHA-256: 4710f8ff3fc51de0c6c9ff19bd9d7cd1ff8e49540b69eb58d2f2bf70a3e78b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://philabc.ru/uplcv?utm_term=need+for+speed+hot+pursuit+serial+key PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aj66k0ji41clv39lqdch9jss2m/69801246410.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/78263878978.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/35590941213.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/top6811ia4ic0t3h8lb235o3pf/88057775079.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1ea30ee6---finimufuviva.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090979682f3f---koruluwusijokafidorado.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/72455940758.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26c62ffa4---12143740190.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/sekozememetifomuta.pdfIn PDF document text
    • https://x-software.cz/data/file/gopuburokolubo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/97a31934f04af1d8f5c4b14a830936e0/fabut.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/96135466969.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7c83d2f397c7ff5be824dd9023a33a33/pazivodijol.pdfIn PDF document text
    • http://ubest.ru/images/file/4792557685.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4s58d42lsjfhpg8kesfnvpnfod/16754289320.pdfIn PDF document text
    • http://fittbike.hu/files/file/34789619305.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce0a77318---koxofugewizevosisip.pdfIn PDF document text
    • http://momsystem.ru/public/file/16477440583.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/47129214949.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/rewefusivopeguduwavo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/tigelinusodotajelax.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/021ddb30c2f48f7a632a0e84df5c1963/gewagodixowidaberinikusok.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/40232214875.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018b54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18B54 21932 bytes
SHA-256: 9d0bebc885537089a272bc0612fe7c426907bdea3502cee9f02c490afc3c3921
font_00_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10776 bytes
SHA-256: 969661ce9790e24a70b00193055852f872d3428c28d4eb95ac37b3a0b4816c67
font_01_sfnt_off00013fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE2 19536 bytes
SHA-256: fc990520d861991bd2933c83da96eb2d5e4ff387dff3515f1a8320345034f09e
font_02_sfnt_off00017343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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