Malicious PDF — malware analysis report

Static analysis result for SHA-256 5458e7b8c619e9ef…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 20:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fd2462fcc459f56aae2ee456dcd7274 SHA-1: 91cc691fdc333e42629d92a81152f9a7d5ac580c SHA-256: 5458e7b8c619e9ef78b27e789f2103c5dab3fb783ecbc59ab58ff3537f8f86d5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable domains, suggesting it's designed to lure users to malicious sites. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mobilenmr.com/files/files/63151881132.pdf In PDF document text
    • http://robalton.es/Albums/images/file///24905547715.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/27912438131.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/913236a8837f0990096dbba11e6160ae/kijenajinekidusibe.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/pumijaletepobijudupovuke.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ba3c7504---makidamadopemegosukoneli.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/68026942862.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xekewelisebakal.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///97273181237.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb03caa2e---pativot.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/22923654717.pdfIn PDF document text
    • https://wrd13.com/force/file/5633704838.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/suwejuxekudapo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd83aa28c9---37934721511.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/dalawoduxisesibiterojula.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fusegugi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb953c9861---1385351565.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/pazikekiwig.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/tezuxapikude.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/zekizaxamijiluzego.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1df1816e91c61f5de459278a8b6ecd3c/55574231101.pdfIn PDF document text
    • http://ndt-ultratech.com/files/83856702641.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5e4313200---85769859776.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aeed39825---kiruniwedodifepopikur.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/52442707482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grade+4+maths+capacity+worksheetsPDF 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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 11036 bytes
SHA-256: d44e69a11ea12b64a063387b4abebf7d26913adb229d4e21182e013214df1415
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 16728 bytes
SHA-256: 30b56f57cc6874a70ef9c0f60aac3db6006395231085f5879d8b955ac7d34f99
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1