Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3d16244814751e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-14 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f212668ef8e5270f0ef25267ad75bf6b SHA-1: f70c0f979e9b4a785bf09af82da2a5680e84f682 SHA-256: 8e3d16244814751ec2a91c2c0b19a4ef0a1a4d37702ca628cf395b9c54431875
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or engage in phishing. The presence of embedded URLs and the nature of the link farm indicate a probable attempt to lure users to malicious sites, potentially for exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637340a8a1---41474706562.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab601b71593---zunopajadasafeledeb.pdf
    • http://americasbestmanassas.com/uploads/files/86677869055.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h0j4tdt1qgej30oj74vk0r1it0/nelago.pdf
    • http://mobydick-band.de/fckdata/file/kotasamotudubimevuzopon.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f838583430---rirawez.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6c0a57a4---39111324560.pdf
    • http://arisutour.com/ckupload/files/3737776338.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3badf037b---fujumidopagekasepevulubu.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086561601168---78251103786.pdf
    • https://allmassage.net/upload/file/20210719081652.pdf
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2432cc03f1---matusasefuxalok.pdf
    • http://btfa.tw/upload/files/32440650307.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9435d3c2d---6493440254.pdf
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/68139198945.pdf
    • http://unsersohn.ch/images/file/nukujopepigezodumodon.pdf
    • http://studionegrelli.it/userfiles/files/likus.pdf
    • http://laboratoriologos.it/userfiles/files/gogidavupoxoju.pdf
    • https://lecachet.fr/docs/files/topopibok.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/rumugomixupira.pdf
    • http://pnmanagementsolutions.in/uploads/dezolexajafigawexu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=paulina+chiziane+balada+de+amor+ao+vento+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f9.bin
dfd7609ecee2bbac6b8069a9b615ec981bcd62e63f216282675d48c414c456fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 18804 bytes
font_01_sfnt_off00010f89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
font_02_sfnt_off000127a0.bin
90c96d9401463640a1ce441acf38f471b36c3ce5fd8af5423f47b44a6051e3de
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 11172 bytes