Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a29aab0d78d318c…

MALICIOUS

PDF

98.1 KB Created: 2021-09-15 12:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a1f836cac3d0bd4f894c9d42e82afd5 SHA-1: 7d11491a5029b4a8c4664707debfcc0e31b684c3 SHA-256: 4a29aab0d78d318c175f3345395b40ea9141071b8de904571da0bf6280301be3
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick users into installing malicious software disguised as a browser update or extension. The numerous embedded URLs pointing to various domains, some associated with compromised CMS uploads, further support this phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://allytemp.ru/uplcv?utm_term=zenui+latest+version PDF link annotation
    • http://kleiberit.ru/files/file/77579209169.pdfIn PDF document text
    • https://go2germany.ru/files/file/momidugipojiriwadegerop.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C78B099E11BB96FB.pdfIn PDF document text
    • http://dzbnf.com/upload/file///widikotitepiveluvabupiso.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kamifanimebolisifix.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/nibarebabisofamabo.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/pederomubeke.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/texug.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/51300253016.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e8263eef---puledarurawuzudamabux.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/baxijixupizusep.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/11679996722.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210904195936.pdfIn PDF document text
    • http://xtra360.net/campannas/file/3737902067.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/selilususi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/48641005563.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/9839275798.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613633a858964---41285795176.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/0t9odbrganf5lmj149756hbgr6srf3d1/35831936658.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc1dc612b311292aa26d00cf5225a191/nofitolipixavofax.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210902_4E584E60A5E652F3.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138aaad6a4bb---duwosumamorajegibadis.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/gomexil.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/53543086520.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9de83b97---padijefavob.pdfIn PDF document text
    • http://hrudolf.com/userfiles/88075677240.pdfIn PDF document text
    • 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_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10232 bytes
SHA-256: 0be1b5a240990664e354132c4518e95db76dbfeee3afe6bb86ab6c780229843f
font_01_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B19 18120 bytes
SHA-256: 56ee2bba882712ff1d7614e71b67c5fbee31a0e3fc0879f8ae1475bf90bd45b9

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