Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eee980f1ddda01…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 05:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cf6b9e2cb7f95b8b7ce1902022710da SHA-1: 9db512cb72aa9d508c3192244a796839f61d1e8f SHA-256: c5eee980f1ddda01cfbe01af04fc46130dbedc609a1b863fc59be5900b05127e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting suggests a phishing or scam campaign designed to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sapientgenerator.ru/files/userfiles/files/84108546196.pdf In PDF document text
    • http://handgun.ee/media/file/96866019585.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2767cc6768---27084457296.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161178bd9e2cd4---fadabelidedomanegu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021073105195087229.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/735255d518129e40d978f0b319653ee1/lurabulavopovodowogogu.pdfIn PDF document text
    • http://dentistturkey.com/image/files/rupojeg.pdfIn PDF document text
    • http://01host.ru/userfiles/files/70798285848.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc59ec5315---fagudabadojapesunivo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bc2fe03db03638652551a53baae17f96/nibusulepimujekotu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/246eb6813121548992d245e9d89cc984/93030484150.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a221c064d1c---pebum.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/vitewa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74c8c5b07---webivigeboribof.pdfIn PDF document text
    • http://slsnn.ru/content/file/zudewonagilikezovi.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/3426347465.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nogowamagexivawo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/22542702082.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610511ca349fd---57360517097.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/menolonefowaruwimukuv.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/72269087304.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jiwoxa.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gezosuzukerimatenowu.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/8544466420.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787659a27d7---gegobubojesuzubawejofosol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=times+tables+worksheets+year+6PDF 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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 10832 bytes
SHA-256: 49011a0824dc4502e136c96cfa68b773e968e9ddcb3056fca69fe676d253180f
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 17472 bytes
SHA-256: ce98ae4b899b84e580b6f627ad3549c7c4635677764bf3a54c5a178061eed012
font_02_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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