Malicious PDF — malware analysis report

Static analysis result for SHA-256 35778db9d13b5bf7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 09:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d293bedba49b40e57ab2fca11403f487 SHA-1: 02eabee10c0ec1a76dcab83852542bab53ee4496 SHA-256: 35778db9d13b5bf7af4233109eea681474a29ccdbbf649eed10a9378b24ff3f0
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm and a lure to install browser extensions or updates, which is a common social-engineering technique. While no scripts were directly extracted, the embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=computer+class+10+book+pdf+download PDF link annotation
    • https://www.gcnaura.in/images/uploads/files/91742174844.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/51298517961.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425e0467f9---60145215302.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/29d4e1252e449753ba4c4e39f68328b2/81984974177.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/fupt8hkg4l4409c2j6bup0kpd5/36373021372.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/tarogijiluweserud.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/koletuzidalebugijab.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fumomukumu.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/tibusosetomovalem.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/moveduwiru.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8de15f653e1ef7fa86e17f5020f3cc1a/15448680270.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/nepobinezelaneluwe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9477e30a6---webozire.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/78143501171.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f7hmem2hu32lnci2avh0p80vui/zuvakimikesasedolus.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xovar.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/juzugape.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kavutupepolimejov.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/21771007713.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/70962471120.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/653f8e6399f54e2eddb2c14a712c928b/99694160658.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/35380188527.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitavadibonarugo.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 11312 bytes
SHA-256: 59481d123acb12bd93e8203947b19d3f763e942a2e30b8c1d4e9fad0bef699ac
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 19840 bytes
SHA-256: 44a7269a00c4ff7ffbc08a564bfeec441ccfe9143798e9974e7fdbd8d6c30a9b
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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