Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fe81f3ecbc4fb8…

MALICIOUS

PDF

68.2 KB Created: 2021-06-11 15:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5ea447b0f70c964f6865c1499be0bd65 SHA-1: 5f3edbc5e7c7166116ed98fbc01f4ac1709eabaf SHA-256: 68fe81f3ecbc4fb8651709fdb4ec5e80eafbe7c2ecf73e4ddb92029d7d9931be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it is part of a phishing campaign, potentially using the search result lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=chemistry+matter+and+change+chapter+8+answer+key PDF link annotation
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kfulut9v1rbcb8judl2rte8p74/diwatarefelofasibanejin.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68241da13---xegafeforen.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/728f996eb1913b730e4466c7b8f7d437/nelulobaparap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8e832ee9.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc1a49f44---5269124364.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a8a7b792---kogiserifabovipikizawif.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/banopuwemu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/639afee2c87c4ecec0833178d5e87e52/kovezasog.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rvsqacilod9a6mmljp2cpsfqvo/jivapozafumovusaleguwa.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0506989748f6dfa1670f6c0c410b074/popelozaro.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/434825682.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f03a0f63d---nadij.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9494568a---nakewibakapij.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ad9ba4d5---roforawuxotupedilonur.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/0115a4bcaf35f2aae5c7850bd2c9c445/zonukopewojefupakumaxo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225d5b0189---84249085939.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4aca038a---83464959264.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/18592955885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 5812 bytes
SHA-256: 2bd2248e7faadd190b571a0243613d73fa3697b66b2feb66aba81b17f489d2a8
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10220 bytes
SHA-256: b0215f0478d1e582ad4521f1e0987f2da833d6571c8129c3ca71de0576428504

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