Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa4c15fc2c2c304…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 22:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 324fb64ad1ce83a6d2774ccdd79cf927 SHA-1: 68e09d9399d8b470653c8704a6b00c5424711265 SHA-256: dfa4c15fc2c2c3044d67c1b9bf20be0ca2b56d53a0918ab929ab409cc435671e
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update. Several URLs are present, some hosted on compromised CMS upload storage, suggesting a distribution mechanism for malicious content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://berallebags.com/UploadFiles/FCKeditor/20210926191554.pdf In PDF document text
    • https://produse-zilan.ro/files/gejezuwolisatamufop.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/raxumamodejilekor.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/podunebowoxebe.pdfIn PDF document text
    • http://ruihuitax.com/files/file/45820666403.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad24060fd9---lokepizurelajufoxivi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3dd61269---babovuf.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/zogifawegibeti.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g3u76svfptvuiekf5ii9pqfql2/27157610109.pdfIn PDF document text
    • https://cooperspick.com/files/lizujelamuli.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kilimivurog.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/dazixemawuxolobosokufaw.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/24282625647.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/df79a13bbcee5c185800d634fa47cd38.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rufem.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/85086916934.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/47997636177.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fuzisuxolinidunizez.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/ripujatanivojawoki.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wodesorezozufugenaga.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/mediruverenijitiluduvit.pdfIn PDF document text
    • http://clanlogging.com/userfiles/file/10909168343.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210916_89DB3F22010D7AB2.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/33154135223.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/gefamodanijine.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e9f5a01b940723e4e56263fdcf50dcbe/36809227531.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/nutoraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nrsv+catholic+bible+pdfPDF 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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 10796 bytes
SHA-256: 56e4061fab6d64f07221e423e3391bfce9f814943977bad58c1da5207f5488dd
font_01_sfnt_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 14776 bytes
SHA-256: 649b83eb515d49d259286c901c652834d1602776825d11842f2d39e1b28c7c8b
font_02_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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