Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8e3426a53770ad…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 04:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2ce6866f0d9ff48a2763024deca147b SHA-1: 83ce7eeaa412b6075fa0ce5184aeaa463e993e4b SHA-256: bc8e3426a53770ad7c536b864efae9c40ab53069abe83444a8dcce9c77312e10
196 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. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious software by posing as a necessary browser update or extension. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, likely serve as part of a link farm or to host further malicious content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=chrome+android+ads PDF link annotation
    • http://traktorpulling.de/ablage/userfiles/files/giwavesavewoxikofitole.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1ec4d0t8p44p31790afvrsua17/47702282534.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/90790201751.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/91630456512.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613908b6e6e0c---badebufulu.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/veponelajizufokonifuweg.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nupajeledavuximej.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/11603324162.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/jibaketarukilebegu.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vegodo.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/96744501601.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/ripulelob.pdfIn PDF document text
    • http://yuha.be/_files/file/95870538100.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/89804219162.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/fozifuroxolerudafozureb.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/56544438928.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135baf8c7d04---jizujofegenubupikupazix.pdfIn PDF document text
    • http://jcpingie.be/public/files/gelifolelituw.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/divomezow.pdfIn PDF document text
    • http://mopron.ru/upload/files/94317857411.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/zuzekinefibagidigotisema.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/fubezavikezidobofo.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_493F295A712B8353.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87938623010.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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10400 bytes
SHA-256: a81f68977f6bd7b2618ae6727144467362e6f767aaffe4324b598d49bd69c223
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 17560 bytes
SHA-256: 51c534f077da090c05e13df5d98e602ddf7f071fd326bbd16904a9bf0fc59ef2

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