Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f95d5c875068b45…

MALICIOUS

PDF

109.9 KB Created: 2021-08-10 06:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f975db51009219ddd961dc54d83a771 SHA-1: 8911629b034d416808e156d9f05708c09b2a1c6a SHA-256: 4f95d5c875068b45ea3b3d8387664324cd118d9c504d88c9f3a53609439395a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://scottsdalehighbeavers1978.com/clients/80197/File/boxezipuzizixadifi.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f51f30d02---dapusugelurevijiguzapav.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/13980037553.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/59655463443.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/38993454612.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60ceaceb6---76879371179.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/manezuvujozizaz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0f5e0eaa6e385f521ca9e31d75815174/93956135386.pdfIn PDF document text
    • https://andrejc.si/files/file/80328799565.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97b0dc5fc---43437811134.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0c6e2daf980ce88ade822e8008dd8496/dulabexanuzome.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9f0c54dabc3135e094a38d31adcfbf4e/denofojamevopubewod.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8eb1e8f10---bakotor.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/13600324681.pdfIn PDF document text
    • https://medtek.vn/storage/file/25769563048.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/7975579116.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/81985205608.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/91256018642.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lafasusa.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/68227728715.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/mopifi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ea718c5b---64088563780.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nfs64v0hiq2bvhdj6gl6bu1q1f/85240770691.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/wonutezetewezimasakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=frases+de+dios+en+ingles+con+traduccionPDF 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_off0001478d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478D 10624 bytes
SHA-256: 1a9a838641a29c24edf13f8a9c2f18d84e1c087a5c0e8c0cad7c4be7f9d87fe9
font_01_sfnt_off00015fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB8 18420 bytes
SHA-256: 349b57449b1f7ccf49a18dcd8f65b8a551351b21f0fbd61fa2df70fff16e8bf2
font_02_sfnt_off00018eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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