Malicious PDF — malware analysis report

Static analysis result for SHA-256 776836bc0eb10dbd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 14:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7aa8ce13ee6564477a79085dfa9ca3fb SHA-1: 95b513be12cb1674a24079384d423c97dba98aa5 SHA-256: 776836bc0eb10dbdf7380d6caff1f35f646108adddd8bdd78e1bdb9d033b8903
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 compromised CMS upload directories or disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/jikaladulajuzoralop.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jizuzigokobulem.pdfIn PDF document text
    • https://funbugs.ie/files/file/50344193985.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/dofuwelorimaw.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/87379221556.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/96785243319.pdfIn PDF document text
    • https://telenovella-bg.com/files/dimimebalumuxiwezituwaku.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8062b09d---54298053630.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/jororawedokebomib.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/vewefamowonolijel.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vitatewufejozexunipedufa.pdfIn PDF document text
    • http://watch62.ru/files/files/61244444980.pdfIn PDF document text
    • http://effekt-film.de/files/file/7946957425.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/22738965386.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c4311197---kaforegegurananelegi.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kedajofobusalumuma.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/61134579703.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/41749959264.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/15192564851.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/78271196464.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/68402820757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=read+deltora+quest+online+freePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/72766119740.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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10640 bytes
SHA-256: c37d7944a78d4c2fd70475a68156619af963d0904f631b4ba142953ef6101780
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 18084 bytes
SHA-256: babdc25889b7a0dd348769bc2833619a4c4d741efc7fa942055500b3afac996a