Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bfe9399480a8a6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 01:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbf2f6504ace88a963231d11b77cc073 SHA-1: d71b97074128ea34ecfae44e87a90c510ced5e9b SHA-256: b6bfe9399480a8a62ead70eb5c227726da333f83452aadcc99c800afee5c5aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=og+robux+promo+codes PDF link annotation
    • https://studioconcept-stand.com/fck_userfiles/file/78700972353.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8d5767875677e6e5190a4cfc6b806727/gigak.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/51069317229.pdfIn PDF document text
    • https://ferropula.hr/files/78941236945.pdfIn PDF document text
    • https://kham.vn/userfiles/file/xugutowulor.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/40952894165.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1aa4593c---jimakol.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/73929791638.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/pelubixelepigama.pdfIn PDF document text
    • http://fteq.ru/files/file/74132463601.pdfIn PDF document text
    • http://annabarons.lv/files/files/11085896897.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/rasikuji.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/malawiduwajov.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/51176145744.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/sizifumo.pdfIn PDF document text
    • https://lasanisports.com/files/6519304554.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/72563997641.pdfIn PDF document text
    • http://licausi.it/userfiles/files/23673789743.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/jinofogewane.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/41687446425.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e66603e512eea41930b2c40dbb5b1cf0/vozerisum.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109082153288067.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cbed57f0059a17e6356fc171bdcd4100/35609778700.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/1811159492.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/militisewixiw.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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 17376 bytes
SHA-256: f7c95f75c870e0081edd530faae891f0c5ac7a32c541c5c3a80e956091b1f345
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10720 bytes
SHA-256: df6c58796227394743880ff0b0a9375a11d7bb7ec6cda521a089c38b5f9b1686