Malicious PDF — malware analysis report

Static analysis result for SHA-256 33669386aba9f378…

MALICIOUS

PDF

82.9 KB Created: 2021-08-08 02:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efb59fa6301faf680d4bddb3b98b7ba7 SHA-1: 2298684c9cd1b753a161564a943e8298ad38a305 SHA-256: 33669386aba9f37838a00a667c12ce291ee08435519d144cffd5369e7f99d61e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of multiple compromised hosts and link farm characteristics points towards a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=guia+para+examen+ceneval+preparatoria PDF link annotation
    • https://b2b-intelligence.it/uploads/file/zuxisuwotefeje.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/guwusonegizubuda.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff147ec68---63888360420.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d8d33917629e38c94a3819ff171854b/39505657766.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7qesf08dma5ladvnhl22fmfv96/keridebafumopijuxanem.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/abo4ovb4b5hmjh57vf03pmlll9/tekuxo.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sulukitorekalaro.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/wifaxakosafavaxolalat.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/886edf6764e0b6eba04f842fd298611b/96885728693.pdfIn PDF document text
    • http://ore-processing.ru/d/files/25929184858.pdfIn PDF document text
    • http://aps-mes.com/files/file/27209373241.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gexed.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/tuginaresofademakipipagi.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/fawalapeve.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c20908c5240994c54eba03363b8cb4c4/zukoveki.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d432588c39e---tapez.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bf476503365881fb1dc3a9a961d69b89/36651233594.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/kiromowakemofonigarogudal.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1e014a6df956a8643dd8f9ad12687f2/lafiwefipamajisulixob.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4781092e---46077025182.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/16104698816.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e492bdb541---86861518355.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/95189109811.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/64771004051.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7a2c7cb25ebce25d598b1fa18b170a43/46264682066.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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10672 bytes
SHA-256: 98bc888f97089ac1a63c218345a2b0c857337bfa7fffc49f598ce33866829dd7
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 18380 bytes
SHA-256: ccdc46cc22f10f8a1da06700474607e05f42416b552c555b8a2667187d1efe7d
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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