Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4040617c9c86fb9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 12:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74bf9b1b743ce1172453dea6b1a579fd SHA-1: 61615d98948cb22029832ff3b93b8b36987a0657 SHA-256: a4040617c9c86fb9d1f4b82262051b9500a01e2b95861507f1060aa89c6ab3be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://indianspringhomes.com/userfiles/files/67563753141.pdf In PDF document text
    • http://daiichihousing.net/uploads/news_file/zujipugaxutewe.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/77795056245.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748ff30f5f---sawew.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/87883991053.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/48500142117.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/57472099563.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/3130401641.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/14540716766.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/34953480657.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fufezarobojelipexuzab.pdfIn PDF document text
    • http://licausi.it/userfiles/files/92624338316.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/wizawuluzifaxilurekebezu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161381380a5c12---83691568679.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/65238584627.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/relofepugijepi.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/litevobubimifedijitif.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11krh956smb2sip5eps4j6teg3/novepuzuxonazepopubofibom.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/22557297692.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/76955602064.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kedodizurumusoku.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090517530973499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=words+starting+with+aePDF 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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 19092 bytes
SHA-256: 3793c3d3cb8b3d4acef82836627b83bcf020924476f22d19b2a1d44603c3b90d
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10560 bytes
SHA-256: fe91461827b1871cd91d2576c17166dd90f4a6b938a0dc40a6fc15799416c25d
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1