Malicious PDF — malware analysis report

Static analysis result for SHA-256 defad6e427d86306…

MALICIOUS

PDF

81.8 KB Created: 2021-08-14 01:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1215e9de387ce488f6dbc2bc0d613517 SHA-1: 39775e9e4744658a636e731f4dfb0517d58115c8 SHA-256: defad6e427d86306fa363afbb980f8053ce913a59d6b48c0cdc253121676e5c1
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of a 'download button' heuristic reinforces the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e030cdd74---33194047791.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2f943294cbcb43ed932bfd4faa2f3c77/4304254846.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/xesozov.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/27166436046.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210723154620.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6e535d5fc41865c0cedf32a231a6a388/23799450665.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c9188be2---zatejogikaparob.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607681276db66---68713612856.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eabc8ea8f6e694ba67eb98e605aac807/gamub.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/7254322549.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/48775713800.pdfIn PDF document text
    • https://akvaguru.hu/user/file/tiwovejidolovarusiragew.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/89045188479.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169967b9f---78008633666.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/nuvenevitutudunek.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/37081646416.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1687774936609bc34746cf9.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e284b26b0e1---27888459315.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/ribigakogurupizutaruzuk.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/femaw.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa98ad519f08b20149c3786837f6559c/vitokoxenojiwigax.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/52937052636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+unlimited+coins+in+asphalt+8PDF 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 16772 bytes
SHA-256: 2af6104b612779eb9103f9a729d5f5ef812ecc72de9dd32bd0537d2dc31ee84c
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 11248 bytes
SHA-256: b5819d2066e7889c28947823d2843ed6fe97cadb6f68b706301d6c0397243a1e
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1