Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f9dc3aafd5a16b…

MALICIOUS

PDF

78.9 KB Created: 2021-08-20 05:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72226f1e441fbd190555f3e9e3a2970f SHA-1: 07d983e9c53dcad13e9aa2f66d2c9abb49706db6 SHA-256: 97f9dc3aafd5a16bd5e7a36a3e10236c6c035de9fcc67419b0f322ff15e7b603
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for malware distribution or phishing. The presence of 'utm_term=download game gta san andreas android google drive' in one URL indicates a lure to trick users into downloading potentially malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6a412daae9a211950b4884e29cafaed3/48844341411.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/4282473694.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec5e6a6a1a2afbd8401043dfd9cd0a02/39204988909.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/00aiq4trvtd2690j91lu4pfpt1/74854920158.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/retufafa.pdfIn PDF document text
    • https://ivanamihic.com//files/72882905615.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/borinewata.pdfIn PDF document text
    • https://datawire.gr/files/files/79040581599.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/kofiromokinegulalar.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/40678643932.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/loxajenalazelupifiweva.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/43e9525bd7ee88a44af5fad6b58d9bc3/80544916997.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7164eaf4---gawasakafozobirasejob.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cdkb1jo7cliu07moueg33d3re/tefinubepag.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/soxovew.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512080851377420.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/41651057652.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152349432865.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jiwuboxib.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tutupa.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/gupaxubekewuwubasokowab.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bad49fdc322---2424612153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+game+gta+san+andreas+android+google+drivePDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 15936 bytes
SHA-256: b059e3a0c6731617a94c6c6adb473737dfe2c4caf932545b61ae8c6b77201f1c
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10744 bytes
SHA-256: 7d70c7b7da09a065983eb4e606c8d29fdd6210b10f0955d11e8dc20fa6c7fe24
font_02_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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