Malicious PDF — malware analysis report

Static analysis result for SHA-256 97048e4b63af5f1b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 00:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ef76e88ff0352d56a37e99d15d76fe03 SHA-1: 6f3b6121f5f3a01fa6715b0e47599b047b1b61f1 SHA-256: 97048e4b63af5f1b3b3190e0d68767decd6d3fd01644fcd3d87edf67c384cf0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised CMS upload directories or disposable domains. The presence of a link farm with a 'utm_term' parameter suggests a phishing or social engineering attempt, likely to trick users into downloading malware disguised as software like Minecraft. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=minecraft+pocket+edition+free+download+latest PDF link annotation
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/nemogu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/38262277488.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/bekojofoluvidef.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a6e6ef30---6961658568.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35452126926.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/labufububelurawodenew.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/45439643010.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/56006683063.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40673510542.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/bupureg.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/25046869210.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6b6a4efe6---18158241895.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/tolatonawarufigof.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/73753738448.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fed653c284fd32d57ccfd1d8db1d6d2/sodomamijeduriso.pdfIn PDF document text
    • https://geloracinta.com/contents/files/33275142158.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/fejowigoxetumavatapo.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/38985255857.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/89799697117.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/67694699069.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/13047367682.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/bazobexodapizowi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4b878c03072ae135b4fbe76dd307a004/pudud.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/vavunenazis.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466da894eb6---78733898946.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/kumumu.pdfIn PDF document text
    • 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_off0000b0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 10784 bytes
SHA-256: 844dd9af4e27a8cb283c56bbfcc9f7947a074722fd5921c7f414d848a05602e8
font_02_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 14988 bytes
SHA-256: 5d75363af14952d84bde7de8472c43a5d5a54b35312ba3c7d2e753afefce607d

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