Malicious PDF — malware analysis report

Static analysis result for SHA-256 130c4768577269b4…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 05:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 010da77114db0be24184947578899f20 SHA-1: 9a2c0f86a3abe801392bcde371695346697e64fe SHA-256: 130c4768577269b40938d115c9be3fe2bba31f35e5392943ae495ef3bc0209aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage search engine optimization or compromised infrastructure for distribution. No scripts were extracted, but the structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/90201639952.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb7a8610---wanojawufupanavajopus.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f66ed04e8---nexewemurogozumojef.pdfIn PDF document text
    • http://skisun.it/userfiles/files/36931567866.pdfIn PDF document text
    • https://educhina.mn/editor/files/sidinukop.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65f3499af---77634046912.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8de0f2b7c---tejarabuxidasomuxasikad.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4702fa3d---31671298166.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fe86d659c3746e018e6383a5b8ab0185/71574361387.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/52f6036a0bbec8fef24c1bbda5c78791/13502553740.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f87db271---5298212691.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ldh17asf508e9nrjf7cj0i9u5b/pigeloji.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/71117129547.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/92260404345.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/43658397522.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/s331rj26aldk7gsf1qf27c6n8h/pidisumugiwevoxoneguv.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf52c3c66---52768559489.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbe6c74cb---54448114046.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28bfcb235b---53853015634.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59444df44---vezubokitewipuzirufupowet.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4877a076---53174387832.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wepevoraxobuvemose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=link+layer+networkPDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10184 bytes
SHA-256: 0b5bb7b7d694529c7f9f5f3f40b470f340ec1b405afebdd55b688b2353179b79
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 17736 bytes
SHA-256: 0ed783f22475719f7962dc7b56ecdd9c57b91b3ccb85c116e439c3cc4fd68bf0

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