Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ac345f94f88502…

MALICIOUS

PDF

92.4 KB Created: 2021-07-23 09:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23288bdbbe33982a601e5a59a2ea0fc4 SHA-1: 267640a90c2790c056f04aeed433c61d24e9b4b7 SHA-256: c1ac345f94f8850275fe91ac3bcf1289fdfd68588d792b8e2b951c31222e5ed0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/54f8612c3d50f77bfc71364254dc6a86/xilexo.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088e38523cdc---teginiveto.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8ab0181d0f11f735eddb21e1c43801c1/75916000533.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/9506326493.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/tobanaxukipewe.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sumatatufa.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/802caa18c5287c3bc7a0e98ae053bcc8/37542102743.pdfIn PDF document text
    • http://www.toptehnik.si/images/56977818649.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/puvoxetedomuxawakupuwosu.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/66428693230.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/77556977864.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607065f6b2ead---fumusutitu.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/demoluzopovenedo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63c8665bb---42056556898.pdfIn PDF document text
    • http://houselandia.ru/files/namugiwemiru.pdfIn PDF document text
    • http://charontrade.hu/data/file/83398042478.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mimogapavepazufi.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/kevanodap.pdfIn PDF document text
    • https://beliangka.com/contents//files/81518033151.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/fetelolojofiju.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160def6af73db5---wojokusoroluwofuv.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/96226303866.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4b03852ac---82201646982.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad859b72c76---86922598879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=four+types+of+measurement+scalesPDF 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_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 10740 bytes
SHA-256: 0cae5f92cf13905372fe30c014185437c7ff78b069c0b167a778958dc61874ab
font_01_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 17292 bytes
SHA-256: d4960db6a46a15a858ded9c5181475be2bb1f8ffde4355067eec9d5988950789

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