Malicious PDF — malware analysis report

Static analysis result for SHA-256 5801eb82c341b15e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 16:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67c3574e7c8553d288ddc1cb76af711b SHA-1: 4f14c7521ecdb1e77912dee9c8835b540989699f SHA-256: 5801eb82c341b15e9f09cc7f5a808c02323d1ef3b8dbf208ac6e98151132121d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=las+vegas+convention+center+floor+plan+pdf PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16115639687fd0---76237971033.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072547b9e907---niposipakaxawuzag.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210827114515.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/37753601145.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118b7fec2615---somozadafef.pdfIn PDF document text
    • http://mutitar.com/user_img/files/xiwotejibumebi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3975e1bf---rebabimubotinasof.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/b029a9dhs8dm4loq0qdgiavkni/41049855698.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/30136972419.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/tisar.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/30657905085.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210627_ED754D89C92A09B1.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070503aab83c---sipuneramosuvorur.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5b4845be230906777045515595b4632b/83893489722.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/r3v1qpb7q2n8v7o9n5hhs1uvfm/58228710641.pdfIn PDF document text
    • http://iltorg.ru/upload/file/82878401892.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6qloqcvps7dmkttf4cbgr9obi3/4094212725.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817100a028d---58453874461.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f78dcd7b---57615630516.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/tuxixigepugatenazisud.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-7/20210607094650115897.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160944c717b6fb---27207938627.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be1f4a984887c5cef8790e1dd7586eb9/fetuzixo.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/bubaw.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 18096 bytes
SHA-256: 6deb41ba762f3c252ebc7ef880f7b20973b96fec57046cde00b7a33e0b9ab213
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 10820 bytes
SHA-256: ab1c3a16ada66be7c4476ada7c90f561a4d86c98a9158f864201d2fd9b605885

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