Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0a25beb9e86075…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 09:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f02f0585393c674afbb042b3d7d3af41 SHA-1: ba9bfdddc6743cd2888e154dbaa397bf62576101 SHA-256: ee0a25beb9e8607522c668128e4989403b27e0682f42eb02fed3ad373722df56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term=download+hotspot+shield+mod' in one URL suggests a potential lure for users seeking software, which is a common tactic in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gyogytornasziget.hu/uploads/files/nivusugigeliworowi.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/memobetekovalejapo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a47d1ebc77---suzegaxamizifa.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/89319949294.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/70944788607.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/gipome.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/bidusesewovuwupaxozoz.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/77315346957.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/fewigisu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac8ea6daa8---panutinajakiwese.pdfIn PDF document text
    • https://agatanorek.com/files/file/23552295375.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385864a9347---fuvekoxugubazub.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/47680748827.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/30379805311.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fefb9a7f---22680271378.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/jonukerinujitusiwe.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/fukudovaga.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkrfjpd4o1qp7rehq6s1kt3ujv/21717378718.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/waxemo.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109172303567892.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/96587664634.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/rirezofulewu.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/14985931851.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/tovuxavevowudizodowe.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/nuwijavofuni.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/widorajuwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+hotspot+shield+modPDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 19916 bytes
SHA-256: 197513871cc916c2b109900b64ecd46bb50c6d86cbb374dedb4cd3233b37ef6c
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 10644 bytes
SHA-256: 792e8e21dd82101ac3eacec0f0ea19501dfd1197672673b97c76a0ec71626c88

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