Malicious PDF — malware analysis report

Static analysis result for SHA-256 4896fb0fe9c83ee0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 01:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: be80f867ee35279397568db35ba777cf SHA-1: 3eadd5feae1b2aa67a3a7d47adb4c9f90985a0b7 SHA-256: 4896fb0fe9c83ee00e85fd1e0a994d48e6d537fef8b889725bddd78709fac162
244 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to external URLs, many of which are hosted on compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. The embedded JavaScript and the nature of the linked URLs suggest an attempt to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160909fb3b2a3a---89256811881.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d619ec653---sajonab.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/mewejiw.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93d3f32c0f---1762717142.pdfIn PDF document text
    • http://contextuae.com/resimler/files/dewixizapore.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/liwafofope.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gikul.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/21643200748.pdfIn PDF document text
    • http://ranch.pl/files/file/limol.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458338ecae---13097823419.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rezanurewewevidarugujiga.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/7255978848.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jmeo630v4cnol73ce37jeoq158/7853559776.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/tewedokarabalobujo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612184d165565---gudituwubegezorek.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5632aae11541b7da70b3f28cadbf4d3/26061945896.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/84291635466.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/dekupetuzozata.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fcdedab43---mefodaguzoniwibiw.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/padog.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/57665799918.pdfIn PDF document text
    • http://it-hair.com/userfiles/35294160417.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776145e4a1---94629322072.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/11663080816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+pdf+resizerPDF 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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 17236 bytes
SHA-256: ac5ef3fb38096f7293d6e0304d759216fcbfd1d9edc92993210d7deb9efe9ab0
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 9996 bytes
SHA-256: c769354c8fbc2a0bcb1b333b3b8b435a48be5b2c3f1386d016396cf18290286f

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