Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fcdc8469e4c000…

MALICIOUS

PDF

86.0 KB Created: 2021-08-22 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 617723e3dfa7a0d8f70941500e44c26c SHA-1: 76f1da9f71a213a491b9e86d4ae741f74a95c1ea SHA-256: 10fcdc8469e4c000a0b61d9ee662f53cbd3db928b2bed79a95421c29f4ae7f1e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering tactic, specifically a 'Browser extension / update installation lure', to trick users into downloading and installing malicious software. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, further supports a malicious intent to distribute malware or phish for credentials. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely leveraging embedded exploits or JavaScript to facilitate the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=can+i+install+chromecast+on+my+laptop PDF link annotation
    • http://geombiagioschettino.eu/userfiles/files/56035945011.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501225146278518.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210611114514-ruxafetevur.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b06b764af4d7c44ef98e8fa155aa65ff/bupatug.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/895eff61052153074bf3b8d1bc537efd/petuvev.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e48c484cc---75535371536.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/88301947240.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/46496990750.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/rudufelafixesotalal.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/98873307874.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be683ae40---vuwisiw.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/74908021047.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef61d57eadb7a4e20cec359aa6ab2e22/32549685633.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/kibemu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c804e4d8---tisijaxegafuwolasit.pdfIn PDF document text
    • http://fitviewer.com/files/file/zonijumufi.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/fipozibeboviporepewev.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00ce148412---37108227065.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f3c0d45c---tarofixesejugifo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/65624631761.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/61032589896.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/59324349702.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://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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 18288 bytes
SHA-256: 6d1f69fb987ff5fb1c23d7ffdcc7df7ff7724ca78ce992ae5bb84e67884c76e9
font_01_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 10784 bytes
SHA-256: eb9b522cb5a11c4b8ca9b9c4b30daf9d0359f5965f93c9f444782609b21c9ebd

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