Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca68fb34dd710f48…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 15:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae5fe805e0ce6108c98999e2e7ff7430 SHA-1: 3a856cd0c1aa9630bf14ef68a08ca3594dab92e6 SHA-256: ca68fb34dd710f48fc77b78efa22c5ececf9bf6c94bee06fe036a4ab116c9c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=video+converter+software+for+android+mobile+free+download PDF link annotation
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/413cd234f2a3739cd59ceaf4ca55462b/zeverovezidolironugotu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12b3684c3e37ecf414ddded35700891c/pafovukipetelumivifer.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawipelaxewusorapufa.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/47390197950.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/16711656837.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/vasasipabodavogeg.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55e302112---xoludosalopipop.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/birefara.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/10920300848.pdfIn PDF document text
    • https://triosms.com/userfiles/file/85700329615.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/fibemom.pdfIn PDF document text
    • http://carszana.com/image/upload/File/42138964493.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/74731744771.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sazilimewevevokoj.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/zupotowetumibawupozuburox.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bd97e432---fupupevu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/12829084602.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/82725599326.pdfIn PDF document text
    • http://gyliver.ru/files/files/zusudopapepewofururo.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/90009856895.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kuxubizesasomimowisipixe.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/godizunapafegekavatoke.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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10896 bytes
SHA-256: 26175630cb10de4367d4c5960935c4a4598550e8956bff2594065ad6112413b7
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16996 bytes
SHA-256: b25f2974d57c3385bb653a16c0311cd9a2bd3307a47fd22bbfef543242856f11

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