Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac1585928c65662…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 13:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea8cd6888e99c453d70e745561d2069d SHA-1: 55fc9c6da3a1c62d4275d20e05824771b9531bc5 SHA-256: dac1585928c65662eeef45ff5178a5f4c46eda796f183d2eb3932890ecfc1831
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a lure for browser extension or update installation, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute further malicious content, likely leveraging JavaScript for exploitation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rubella2.integra-sh.com/userfiles/file/sulemejagifefofexiru.pdf In PDF document text
    • http://xnucleus.com/members/member_images/files/51796086806.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/lozizu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed49855cfd---1879495687.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/refuvojizamugodidezutarif.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/ginukajevimipesawed.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wurusepevogufa.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/19432459267.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/58262365001.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/xukulinovajasiguwixiwibe.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/vimusurunupisuf.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/69016480753.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138721fb741b---42541165575.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/58401088108.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/digutazon.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/44724218944.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/24935426637.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/newadeb.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613446246aa3a---lalufidekiditatedilo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/riputolonosubabi.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109050221232004.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/guvezafabivavu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613310594911b---49649796121.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9ccc3cb8---9084153468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+remove+duplicate+contacts+androidPDF 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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 10916 bytes
SHA-256: 0912e1a21e790c2e6484449b5b32b566c0091113f85527b42742de8aff1530d5
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 18268 bytes
SHA-256: a8b09a71c8cab8abb8e3a668c68a91699a9a2af169702ca27c47a12a1cc46a40

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