Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e4ac315852cb9f…

MALICIOUS

PDF

109.0 KB Created: 2021-09-11 02:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5ee7e4a06c8ff4520931e37ba3d06c9 SHA-1: bb1cbb6f251723e72d95962c805d99a131fa58b1 SHA-256: 62e4ac315852cb9f74935159903d1fa9b820b68c0f109a6dc75fffd5f19b1b49
196 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV and an ML classifier, and contains heuristics indicating it is a browser installation lure. The document body is heavily obfuscated, but the presence of external URIs and link farms suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack designed to trick the user into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://queure.ru/uplcv?utm_term=one+piece+episode+941+online PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/59019757803.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/52436392623.pdfIn PDF document text
    • https://promise-land.com/upload/file/27260934846.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/remegobujarufowivuvipem.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf5452dc4---35733686379.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/nukojifuleratuka.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/pegize.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210906_4C3A1A71A924B5BF.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/nixitaxisovusuz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b008b59199b57e86fe8b85a3f9e468d0/21347990074.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/73282553945.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xomilevabixejikevonixafi.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/41535864664.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fizogakivomerip.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8df6a9a56e2ee811b569378317d0e228/salafared.pdfIn PDF document text
    • http://huiking.cn/uploads/file/011910163417.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xegojajafirakulu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210909092743.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/77918314177.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/3148293026.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jilofufunipawakokonal.pdfIn PDF document text
    • https://expomediainc.com/upload/file/6542866915.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/63494774951.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/muxubikelirobinujugiwo.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_off0001393d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 10468 bytes
SHA-256: 4c5847a83f25e3b133aeccd4916dacbf48bba1ad2cb823f5a0a4b3b695ae60f3
font_01_sfnt_off00015132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16944 23796 bytes
SHA-256: 119cfa2a8d4f0630c6f0eb0c1c521a14deb8b083f7bd5e77d8aff98630d48264

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