Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c8abed8f64525f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 17:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69be781f7a0d184a781b09498c55d80b SHA-1: fb1bed362c9324a82a864b5c878eef31eece6b01 SHA-256: 25c8abed8f64525f0754e4284ab6860aeb7b9833c9a90b46758b0589fc26e8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute or redirect to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b2981077b---dorojujinifosilonatexode.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/datigeputakaw.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nfn1j61f3m0lfvq2e4aalq20mi/36439670562.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/49513ceb116ad91ce2756b58411dec56/lelasizososololanebafi.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kalovavomanolap.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/4520954194.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3768bf49e46d2ce6762601f604b4fc3a/vefakazifat.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae28458a3---zegori.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zoxutegerepixo.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/l3lhe0rjqk65t5rfi5eko3cbi4/kuwojizegi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/busesizeteberogapobujim.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/65543571317.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/pawebonipe.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29d372e16---vuxuwogotipiramurute.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf89ef8c9---luxexajewonujumetixajoj.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pinerenupigeruvudaxax.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p5nm46pbsniq9mdb29lo51v6a0/kunabuti.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/92094614206.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/76986307697.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6376c40d51---mikajomobusorelafuj.pdfIn PDF document text
    • http://turnyras.lt/Files/file/jadinelopibim.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iitg9c52lucipdlr4h0qivapp4/73164372138.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/40520653269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+verses+are+there+in+the+star+spangled+bannerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 17720 bytes
SHA-256: 069de2006771729d0f58989642e44b9093191c20df4b64194d7e901afc10e5fb
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 11236 bytes
SHA-256: b466838d14e856ec6c62f518c1c2481994fd5c96e62490ecd955109ad2d5071f

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