Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6ad43a4e75de4b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 02:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31b1fcd6ba2f0e71a3620b8a9490ce0c SHA-1: a314499a68ddee474f49c63ec94c62940235ac85 SHA-256: 9e6ad43a4e75de4b8db8acaf87161a2f6de0a3ccae185cfa05ed0844443d6ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://wwstationery.com/files/file/buvig.pdf In PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/aa979eb80c34e54b92c585fb49040b0e/xifamabawu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/72cc3f1213b40cc63bdb95b62198c3ef/8741768135.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fa447a4b5fc511988a03f91a13ee6a9d/45746508325.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/kumuf.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/45521572999.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/vagikozotani.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/nonadugiwafobuzama.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///guloduramitupera.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/zigoxagexi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa8ad7cd9a---vamemid.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/13e64b342a23d5bab7d7193bf938b8c0/xevopiler.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bevulovipifuvilu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/98646800168.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/faddbadaae92cea68e1f0f47571ecfb2/29622580267.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ae779c421b902f75570db124e375253b/41060818677.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/53ebaed8bd5c170d5e06e57a250c1fb8/fulezirumegezurenipemuliw.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021714152319444.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/67108097717.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8ba7074142cca61c0ac8708ed173a34e/83129354019.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/78749051206.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/luvitaj.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/dosifojesajexewosakavawam.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065a2dea2f5---62274029190.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f997b459c---towepapuledunuwomavu.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/jovutekavadoxa.pdfIn PDF document text
    • http://holzbau-napetschnig.at/temewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adobe+acrobat+dc+convert+word+to+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 10580 bytes
SHA-256: 27743c04d5effb3954c7d5c89d68bf296dae7ea1c365d92160f5e8193d22a8ea
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17460 bytes
SHA-256: 10f7fb37688279e04bcbca8053ee8d9e8ea2b6c801c854e550b74892d716b034

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