Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f932739bcc0e9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 18:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb5e3c4bc4d8f93c484f283c90c3cdb6 SHA-1: 629455ef03102e6c02258026ae442d16db358212 SHA-256: 907f932739bcc0e9f6de457c011aa8395b1ab784e66fd043d0f28b8d7e04b188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=excel+vba+pastespecial+method+of+worksheet+class+failed PDF link annotation
    • http://capitaloffice.pl/fotki/file/95139317267.pdfIn PDF document text
    • http://soc-in.com/data/media/files/68107260258.pdfIn PDF document text
    • http://bdnchem.com/upload/files/48925066584.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/51e4963603ba18d0f096b2cabe4e9179/kibexosijekegu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4d425973---voxoxonutubikujosujifow.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4f31c7cee9a6898f7a602848593db4eb/2331824687.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/68731265497.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/7023152000.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i5hmof8c5ft0j0hbt1gkthaai4/faxememun.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/siromifubejezex.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6170691e5fef2372473287a9409b021c/gubojivuxabirusimogoxoru.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fuvekixomi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc47b981d3---63053382315.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/887e4565cc3f0fee398e0b4883043a49/momobatajobusuvegovowu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/63455722155.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/vomimupepafadonokofavej.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sidevoxezetuwopa.pdfIn PDF document text
    • http://bienbao.org/uploads/files/rukosobut.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab149733533---nepev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f206f339220---77034097127.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/80933410623.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/bh9jolbdrjtkd86os66n2fbg6r/kunofuguxutuxadijimene.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c44002ba1---29288968884.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/21829699345.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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 20120 bytes
SHA-256: 14adfb69aeea9bb7f0215942b355e300606dabedb5aadf349a8304c0df1e534b
font_02_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 11252 bytes
SHA-256: a81f5af7934156780015d5eaf01a19867323d14b346e6a3b91f684dce90ef76b

Open this report in the interactive analyzer, or submit your own file for analysis.