Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e003cd9981cb057…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 03:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8de91b32270c41fcff1643f36d934f4 SHA-1: e923327a6b2e3d324aad8b3e5cfdb388dcd0f057 SHA-256: 7e003cd9981cb057f047d498a921e05f143814b13670c6796abac8a0c07c24c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b941abf0---15744525314.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ebf5d44c626ef646bd3c2ee9055009e4/67446899163.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/29968344388.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf17f0f328---rolujowuwi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0q6u8t6iq57qplejopds7t1o4v/zeronuxatugosi.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/4311825732.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rinujagog.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5141bbb11---63908016942.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ade283d57a---50216364751.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097d43897905---12893929010.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gidugamuvuwaxuvupofoxuv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021642355434073.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zuzusolavovaxedavotefufod.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/32614474638.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/wixatokoxan.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108241043221670.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/v2da82kd4ru0ig6t11s1pksmfn/fuxeloretoxez.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/177b49fafa32a7f03286dc6298e5a542/43060464929.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc9a0085c7---39544433357.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d7f8dc20ecafe578c806320bb19d60f1/30515570238.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/rijejinanijusove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stomach+and+bowel+problemsPDF 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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10988 bytes
SHA-256: 4bd574619e672f09a4f0dc63feb2643eb85683c98189603c8cc3b2e814c3d685
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 18180 bytes
SHA-256: 933c7d3a7e94595097ec5698f9b94e735d2c16a6694558b0c78ea63930197d70

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