Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c9aa3b99dda7aa…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9f204c90b4944dc3d06eb88cb57c89e SHA-1: 965c43edf59322a4c1ab82a4d0d113c93c1feba4 SHA-256: a2c9aa3b99dda7aaf30bed805460f54834b28de563f7d6b6d35e58bb5e6541f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lawweb.info/mycms/admin/userfiles/file/53610637317.pdf In PDF document text
    • https://larrialdiak.es/files/galeria/files/54979097791.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/xejizofibiwogepogar.pdfIn PDF document text
    • http://xycrusher.com/d/files/83281991138.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/32764729440.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/wudagubomomixawimamok.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8ec96d0f3d55fe3eadc9a32b65ced174/22161003358.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeea355bb---siguzatufupi.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/2672295252.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109141309035643.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/11410993777.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/bobiwaxanijar.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/50285268222.pdfIn PDF document text
    • http://w-mill.jp/images/file/wiwexamovudivelexifigure.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/81073819741.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bolasexalotarabirogiko.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/96706743015.pdfIn PDF document text
    • http://reichspfarrer.sk/file/87469856232.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/31776435226.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/83326311806.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fugiwoxutujev.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379de05f895---rexajivegusarofidaziled.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/rakigegu.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/pisuxosejipaxiripipejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+walter+mitty+online+freePDF 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10624 bytes
SHA-256: c7c658b278dc4a93b88b76e262ee29692b46c45fa4b1ab0e7e18457dcbc06987
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 18036 bytes
SHA-256: ff45541554ebf26509dd63db219eb66983589c0e3baf8280f0d3ffb12680bca8
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.