Malicious PDF — malware analysis report

Static analysis result for SHA-256 e212b6b01e21e328…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef11c1dcb8515450f0cdfdcff4f7cd5a SHA-1: e115f5649c9bfe9700953f634745b53f4f5f661e SHA-256: e212b6b01e21e328a1cb589fa50cfb06e882d7f97473f630bf8ac966a0b82802
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://adamslakeband.org/userfiles/file/xirafunesodijusab.pdf In PDF document text
    • https://proxus.nl/file/94681066824.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/90988865359.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5ov9kdj7pqj907q9kju8dpunn0/tadoropajosesuxona.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608704ba16b56---lijupuba.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/92019736725.pdfIn PDF document text
    • http://goref.ru/files/file/bizakulabekivanipotupetem.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/58646754445.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kibupolowa.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/xoleralipudezakopeni.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/89177885726.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/lonexoxaleb.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091697836dba---safenegolegakonoxeseveli.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/92116660209.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/76031256842.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/71893259638.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160787a2e3e9ac---7044650083.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/40595741084.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/dupozumo.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/wobapofijin.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705bcb53fb2---vujutatogewevimikemi.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/83650319040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=liver+and+kidney+image+in+human+bodyPDF 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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 17220 bytes
SHA-256: 341ba0ef150ed41a3468cb8c3ab0736c750c04ca02f440a2bed85a64f1f179de
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10852 bytes
SHA-256: 05ac68be18c7683a8b969a032a50e393e4a3ebc2e17e3b721be80831acf67464
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1