Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ab63a299286e8c…

MALICIOUS

PDF

96.5 KB Created: 2021-07-03 16:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0e36fbe9d0fa6a10d22739dde9f4a9a SHA-1: 4af0f518859e9cf55e59b0ac6f6ebcf8cae573d7 SHA-256: c6ab63a299286e8ce16fad102d79c28ca78e97c366bf0b176ad6fdabc5d25996
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, some of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these compromised sites, likely to deliver further malicious payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/714a6u32o089hpc51rdanuh8u0/wixavoxamalowa.pdf In PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/duxepuli.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/68869535122.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee4c9162a---kaselejitexenageroketa.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/gegunabunidaloses.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609612aa29a1e---joxerajugotudive.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d67cc4d1a71c80ac024352e232a1d33b/29471165653.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3b67afca---21133725242.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0c3888488a58bf928738cdb271fea12a/pikupuwamobaxux.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a656c72ae---17983138707.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/48e8dfed80ddc3325a18f6f629cbb72f/nunazoj.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160744a5f8eca5---sepofadariwazi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/33019703055.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/476142245.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/3870662010.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87d1e8aa3---68324685714.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98b17b56f877762f746ebf43dab565bc/10849373614.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddf66655d---roxivuj.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/92336346067.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4e73c9fe---23918341264.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0f1f9ef3f95e4ebda9712d921014c9df/makewalureroxewej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=stop+motion+photoshop+tutorialPDF 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_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 17100 bytes
SHA-256: 756186aa630954151421c07a484fd36a77e779377d7e8e5d326af86f27fb77b3
font_01_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 10560 bytes
SHA-256: fdc94889e312d2f28074341d506bf9d7ddafe56e8884535fbe783bd73674995b
font_02_sfnt_off00015d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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