Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d5c2e96e7827ea…

MALICIOUS

PDF

89.0 KB Created: 2021-08-10 20:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5adb67665a01027a75ab7c0d3aaf2e2e SHA-1: 2e4dddb7fed52cf363a40eac6382e3029bf5654b SHA-256: b3d5c2e96e7827ea5948e69bf6b71ee69377f95007a6cad1bf59d9075ee899fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://coretry.ru/uplcv?utm_term=tamil+movie+download+website+name+list PDF link annotation
    • https://noihoithanhtuan.com/media/ftp/file/63047048698.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/gaxapokofibopiw.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lopojapi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098f73996ea4---budonarotali.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/677cf5fbbeb4c7f94f9618d2b8628ffa/6220241819.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f073e432c36---gojiliwomajajozududi.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/rifogolit.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49978f0089---32230424012.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3cd5e4a298a2cb889b693a859a2198f5/bediv.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kedemunogowijiloma.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8030173b98---karefanedogaxemulepajifez.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julupadadosefipobizujuk.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b0e535e093b138ccecc0b447377fe015/botekedanimufitekeraduluj.pdfIn PDF document text
    • http://tele-video.ru/upload/files/97587553344.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/putitugimogepipitag.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/84307017723.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/50408911066.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b4418b9d---66666383606.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gasuwokib.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/doxisiwa.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/36062720760.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.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_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 17360 bytes
SHA-256: e3e7445556ad4664e197c4d0545cb65f7d76de6528376be8031b3b05356bbd21
font_02_sfnt_off00013d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 10564 bytes
SHA-256: ab8e8b7adb75f30e8e268cb08a5944f579f2294accc1345e7a5507a2097c30f1

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