Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf9306c61ae088f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 01:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02417935adfdf360ba83be1161dd77ba SHA-1: bc9e61d322272c80d58d0e7ca26f6359e95bd5ed SHA-256: faf9306c61ae088f0304ee0f840d66909ab9ea5510b01a564bb01c603bc12a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=escape+room+2+full+movie+123movies PDF link annotation
    • http://ohana1bbq.com/uploads/files/33030098412.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea25d75e92---46783896561.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/taxalenisitesozunoxazusav.pdfIn PDF document text
    • https://0900107678.com/upload/file/wamix.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/zepajadajotikifu.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/72079805758.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/69310768757.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/7836667578.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/kugikijakizugibux.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109220115331997.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210923_011021.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/wevubagojose.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zukaxisudafise.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/28747218332.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0e74b15a18f6469f10cd56771fba367f/59750505748.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/fatobarugizaviniwi.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/duvavixe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105f633667---99049987321.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130caa0e6eea---vumawexixi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6dd3c6ca5c181e3086e11ced3d20a054/97100925164.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/61043095031.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/zafonefezoj.pdfIn PDF document text
    • http://idcla.net/upload/files/6056138048.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/30412057208.pdfIn PDF document text
    • 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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 17376 bytes
SHA-256: d6b641d6ed31fe6d4887c0f0829c62c6e050cfe103cd369f742b82a80447e9df
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 10932 bytes
SHA-256: 80b503eadfd8d58c63f57e8eec7cd6f9dd3e784c430bdd2b4699a7a58acbb190
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1