Malicious PDF — malware analysis report

Static analysis result for SHA-256 865216fe0944afcb…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5bac4ef821701dade93aafd51fcbb3e7 SHA-1: 65959f36f963533276b8287967f9c35b2f374b2c SHA-256: 865216fe0944afcb9ed47f600749c3f14b4284aa710549ccc382173e0a698e8e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pharmnet.cz/ckfiles/files/files/bizawolotixeregunig.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ee3a8bd6f259734ed6a4992846c82199/31164162886.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d94e32b34---rinuzofuxazolukutejodenu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/mopasisivibuxirikogonuz.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/digujibipugokizawa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3cbf7e9b5---walevodap.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ab4ca7c01e8b0f056d73c58b6cebba87/tesavesipopojuwivugejibi.pdfIn PDF document text
    • http://sireny.net/share/files/jipilorus.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c6e24ada---70951436819.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/12519925491.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16115469418814---fobubirikemiz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7eab6c9ad1ef343915c8374a3f25191f/13144858512.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/90726357995.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/detipexatedifafepugezaroj.pdfIn PDF document text
    • http://gysanya.com/upload/file/210803203742778056sp2wk9gmx64o.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/detitetiralerutufurup.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/02d9a93bac9687306fd47369b9df14ff/paxosidolusodej.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/livaruwuzenem.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bisaxepajevibi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t8fukrf9c6hk0qekfvmmrlthbp/gagakobukususogavoxezajev.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52e668d3e7f446df8b82bf8fc4e0f634/8720522431.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/68060180199.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71838966038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gopro+session+4+manual+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10776 bytes
SHA-256: 2a4d60799fb05638d0e1c271bee8cb8e4098d9c4c0a8ceb81d9c357aa0597dbd
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 18136 bytes
SHA-256: 62b71d6a6822c50c30423966ef0c78354ad3253e34361c863bad64c29f4d5154

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