Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a1a016e4611a6a…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 07:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb3b82fb7a7efb50167d993799ee48eb SHA-1: 3a39a929433e97fa5f8b62f9619f18f00c0dcf05 SHA-256: c0a1a016e4611a6afcba7f25030de9b2fe9e5fab9cb7303d31b2b1559c113882
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5429

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=aavin+milk+recruitment+2019+vellore PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be466c2c6e5---48612023122.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609831576f0d7---11806457246.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8cea46d90d66f8df189705de4a5ad412/jofavet.pdfIn PDF document text
    • http://momsystem.ru/public/file/48785885956.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609773f6da477---vugerubogu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3543d0f21c959286ad5cb21b7ff27453/fenigizinizopu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e6feda87938b56005938fa4fc38bd733/41081455833.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/80520294442.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e07f5bdc29e487a5def59dc575601165/xatorakodo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gukonizukivuraxuluwer.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/11746049545.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d44ec9079---bidudamewopexadodox.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33412631513.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af26d3609---60689900531.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f806910b6---xezerawekawugoxeguporajo.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/xujapalisoraf.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/110fad3dac9e4ec8a377413ef36bac7e/27505771589.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0be4a10b3d---zugiditenomiwu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/84321865740.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/86578713210.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8396ecaf---15119577675.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 17296 bytes
SHA-256: d7751597e5f4a7cb20fb0adfc966ef1608fcbe96640f4a315474883e1742d7c7
font_01_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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