Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dca3376ffc09af…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 09:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cfeb174876c3b5160b155d6c56c779c SHA-1: 1c2d16f98ca18ce9e06b6830a9d3dcb96b275708 SHA-256: e4dca3376ffc09afd4bca24e3a3a2fcfda00590de467637c43007354490f7884
196 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://coretry.ru/uplcv?utm_term=apks+on+chromebook PDF link annotation
    • http://studiosiriosrl.it/userfiles/files/gugaxeparufevo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/zevegarodoveguwifuzato.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v268mr036hnn873hvq4kg6fvr0/divazag.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/wefewofatetipiremifa.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/2796450430.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vojafiregevepam.pdfIn PDF document text
    • https://webmenuplus.com/images/file/bulejugupobuzaginiwejavuj.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/17769531352.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/gogemepum.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/biwafajasop.pdfIn PDF document text
    • http://santehnika34.ru/images/file/77074124927.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/tiwexipox.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/44636463687.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m2ivltivp096ug9gqmtij91o2/52642516765.pdfIn PDF document text
    • http://www.bash.cl/media/file/17000144536.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wefopoz.pdfIn PDF document text
    • https://nevisnews.com/userfiles/fibazibuzanobogo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39d328dc6---96312688797.pdfIn PDF document text
    • http://wdnederland.nl/file/vijisemewagid.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/27736001196.pdfIn PDF document text
    • https://andhimazhai.com/images/files/simojolide.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_5D0383625CAEB598.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/vovajufifixujixi.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/wirogugizudazizugosiriwef.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7074086683.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 19184 bytes
SHA-256: 7ab4d500090c863ad3d48bf1ce4a348522a1248a8d9559bf93930c94e375d503
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 10456 bytes
SHA-256: c2b55a9c627814d4949b233516ea7eede6daae0eb28cd4f78bc39c3b644f5bae

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