Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf4563f6de5f49d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 03:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05eee07446afa76c61cde89f2e1cf131 SHA-1: 9000bb920189e1d33a2f677a7b904c103603aa2a SHA-256: 8cf4563f6de5f49d7805e6c31fdc4e4fcdcd0c6a4ffafb390e7e448489697b0e
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096a459deca6---volusipatoxaviwu.pdf In PDF document text
    • http://bobiniauto.com/userfiles/file/napupumopunedulodak.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bg6qp2lj2teo6b684fjl7qk0v4/vogonusipabawujulafat.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/wusugotawiwolo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/eip3ufgj3lgdagfssk9fvrisf2/28267725612.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b5d2bc4d---kusogiruwiwitug.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e13c122fa---vewivekejurezamagus.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160916880832ff---16322374731.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ecd4d80b43---zepijixotobedijedasus.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/53fbd4278209f67263fd98f08b8eee2c/31398298459.pdfIn PDF document text
    • https://securitydm.com/slicice/file/wupikarujujotenexab.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/12392284087.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210828_F6C5DEB99247A9C1.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/nakosutumukomemegofisu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fefagorurebegazirelipix.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/75593623334.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/tekidotuxagewikalu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56efd9e56c---59350295472.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/puxajoxewo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53091101364.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/82987646550.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076da0c03425---37955843149.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a95a51619---rixutajodukakatonukatevav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd7e5ffbd---67761558328.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/8834726146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=predicate+adjective+and+predicate+nominative+worksheets+with+answersPDF link annotation
    • 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 18784 bytes
SHA-256: 9628aaba61167021c289f9ea798ead1cbfd8359fc948c83cc1ca171ad6e892da
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 11108 bytes
SHA-256: f61d7d8af168dad7050dda378b9415eee931296feaaae14100a0b161c5b553d8

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