Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e06383e981a931…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 21:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f77dea17a41c8bd97ffcdc6984e28f0d SHA-1: 0f6f1684b80acd2b611bfb315fc5ff9b6449a826 SHA-256: 76e06383e981a931cc734c39b5974664fc59b7b0502a9cc26676b66ab5fd423d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the link farm structure strongly suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/73747497553.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ba60555e951bc76b26abac5f5688779a/44473326826.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c106a044ca---56562741206.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/30855492582.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xapofavel.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/91034916305.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f14ab541601b54fe43c08ce2ba9209a0/80542704147.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/jometadutuwora.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/lejebate.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/faboxikesekivu.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/87989532958.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef4d7eaf3---1955906925.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/53476558480.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wuzot.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///jakaxazirarowewup.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/tolepalujadofeti.pdfIn PDF document text
    • https://healthandetc.com/ckfinder/userfiles/files/34525911759.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d9be6dtpun9di6fvnlq6scs1b4/23901132967.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/41859249475.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429811453458.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/92476480020.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/17787019283.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/5091550588.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a9e282c4591a3a96aa78290e89fcc8/21013741132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=save+word+file+as+pdf+using+c%23PDF 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 18252 bytes
SHA-256: 4338c8e51752df35feaf87b9be1b432583855c789143c3d4421859ee57ac4771
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 11024 bytes
SHA-256: 4a4db392bfdeb57b13a3334dd5b40c1754229199b349b377ac1135059f090d7a
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1