Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77a3f763c3d76c0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 02:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 15eb4a96c95c4dc48e43a453dfe148e0 SHA-1: 12490406a56b72d6378ce278cf25d521456c7a24 SHA-256: a77a3f763c3d76c0484ed5a9b4e5850efa02b3c06c97523c3ca696ba8e55b27f
204 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests a social engineering tactic to trick the user into installing malicious software. The presence of multiple external URLs, some hosted on compromised CMS platforms, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://antitumor.org/filespath/files/20210908172449.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645d8d9639---82837701038.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/vetuzixijifusawofobu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/197a147096beaf0799531754f2efd322/59281148201.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/gazoduvapujunifiloje.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/kutomoxurefejufabefabab.pdfIn PDF document text
    • https://mmtours.si/uploads/xosilifo.pdfIn PDF document text
    • https://semut73.com/contents/files/99423538159.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zufubinelegumajizedum.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/94365312391.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/51917990341.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/38995125976.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/56477526772.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/gaxevizujupomilizodeka.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/30742500932.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xugusebugefuvajax.pdfIn PDF document text
    • http://linker-apps.com/files/34733419024.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_A3790CA83A57F82B.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/namezel.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905172411.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/8485833215.pdfIn PDF document text
    • http://innotack.com/userfiles/file/pazanovavakesa.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/84372380891.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614093351ef2a---duretidowibof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jodha+akbar+full+movie+with+english+subtitlesPDF 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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 11276 bytes
SHA-256: 98bff990a4e082f3077959f41efdc2f5f03f8b7f8bdf22d0784b406c5ab8a76c
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 18612 bytes
SHA-256: 9f9530dcb66dfa4abb98b9fcb174d41e36cd3299c1fbc4cf1fed326ad0376bbb
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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