Malicious PDF — malware analysis report

Static analysis result for SHA-256 884b3b2933d42fb8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 11:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f74dca2e8f06501dcbb13fa886dbe8c3 SHA-1: 9aff267a971d16db7503b347ffcb45fd83bb6de9 SHA-256: 884b3b2933d42fb87496a828696c07b5330bfa1a98d03e92a69e8b276f757177
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains and compromised WordPress upload storage. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://rujiahk.com/uploadfiles/file/7511228305.pdf In PDF document text
    • http://essentielles-theater.de/UserFiles/File/kejoruxozakip.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230b5e6b4c---virozigoxokis.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/zulerenilogisaseberegar.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/tipimikifasesudagoseviw.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/8607785646.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/37590731074.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/76907059414.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13887900715.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/51206826109.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/26098418312.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fvno08suik5ouu0ad51oa9v9p2/19176508454.pdfIn PDF document text
    • http://chinahanaro.com/userfiles/file///piwugolebolifominubijoxu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcbp7484lihn0dbd94g5jnb8so/mesunukafazavim.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/58002764182.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/patilupefes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+app+data+directoryPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 17084 bytes
SHA-256: 52d22cb5260f703f1f229e894b27ab8799a23760a7a6100b4d90d812de525116
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 10388 bytes
SHA-256: 87711ff89297507d9a74a9783373f0ef26024cb232217a9b20f391b8749f36b7

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