Malicious PDF — malware analysis report

Static analysis result for SHA-256 feff18bc0d7bdc63…

MALICIOUS

PDF

76.0 KB Created: 2021-07-03 12:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c9858f9da721d953bc9edd729fe270f0 SHA-1: c144753408e2fbb3cd37ab3da738f9661b57d658 SHA-256: feff18bc0d7bdc63a264dc072e323c9113cef1f1a871e0c4c044a1b5c59d02b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b31e493d---58124751965.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gtmvs7geagf34rkujsb9obsd7l/kogowuxuzavorojatubu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa64c2e5f2---36857747146.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10c14138aca5065036fe7c9abe7c5f7f/kelajefakesipelegurub.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vg8vu5o6df134auvp61jbuqshj/54200426901.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/s6n04795b29mrjft720o5tvq03/82503516212.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0b9mtv0go2c4em6ba0nja2p62q/50700060204.pdfIn PDF document text
    • https://ferropula.hr/files/debipifixelosevixiv.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23355444783.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a769e94cac---32473300852.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d223f4f571533d008a61d8fe43ddd23d/katafa.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/kasejawo.pdfIn PDF document text
    • https://drsaman.com/files/safaxedo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a16db98d001---tenuredatijoladafegise.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg2ku99fhlmgd9a1rpo6mfi16n/83875830081.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/dafijufadizulesijoxod.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wodepalutujupubapakagiga.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a7557ea0---68419281804.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1585b87902276f2c950af28fc7096459/19586140159.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3131089820---safabagorotaj.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7urn7k80lckudsshi609v695t4/dafat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fll+to+wasPDF 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 17404 bytes
SHA-256: 3f977c02a22a58e3489d28ec8261b9ba9dddb329215ebd366e7a33fe6bdbaf88
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 9736 bytes
SHA-256: 5dd85a5e49908e1f0fb27e73082e28c907f844639e8c89aeb8cae68a136c8496
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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