Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebf3e1238f1b85a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 037228ea8275960c972525a58bf604ab SHA-1: f4a48ee57c9dd72ba6e19f64cfe6f5342d507f23 SHA-256: 2ebf3e1238f1b85a9e04a17a13f7c29c4f2d70047119fda6058aebd58c8c0fc7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting a distribution point for malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://glearningsolutions.com/userfiles/files/tekuvatazadexupamanulas.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/81291312686.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/71916861678.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210610213154.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/51768450201.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3gdqgpno36vc638878ikdo8ll5/13860626658.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/30bbdttvpob3honu2428pugup9/65748799017.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1854281852339c0030649b1f999563de/47251861815.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/wosovokokawab.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/83730655158.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/550efd2042b4e9f09db817f8754ed839/64744872518.pdfIn PDF document text
    • http://traviet36.com/upload/files/teradirapabutelevigupu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/50365208862.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a519e66f2b---23328745210.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gokefexejesawaxoladeteva.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/pogogagubololujedonozu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/96910443153.pdfIn PDF document text
    • https://akemi.ro/hirek/file/42796894989.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea0abf107---ririfusuromenotirelukaxe.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/126j0ffs6s8202abtppbeo1ghl/29886472911.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/87155671088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cholesterol+handout+spanish+pdfPDF 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_off0000b1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 15880 bytes
SHA-256: ddb0fef46b2acf9b9e39c97d1aab2d1ea162352eef6b96d17b6892258a6118e9
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 10724 bytes
SHA-256: 90321be03d7aa3dfce44c3cef70daa2fda86e889fb9c4d273063df87d1480489
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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