Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab505cfeff4f9cbb…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf14d115d7efd172dcd7844482e2e574 SHA-1: da35192af5b50749b410f8782013cb8c9c2c6f67 SHA-256: ab505cfeff4f9cbb6b821b02bfe4be5a654f2fa344feb7e95e37cb7cb07d2c9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4a5a89c21e0bd4936f702c2c4454ff4c/guzujemegiwakunatod.pdf In PDF document text
    • https://kopari.hu/files/file/fodibugow.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/76500689885.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/99038346789.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8db9ea56c5069046699ee5f9a4348abd/jokorotijubesu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jeq32fv3okimtjeajbedcpjc4n/lobavonuxalijigosexo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d567d26369---bewobosuduliwagovesex.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/96481152105.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/viwuvamo.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/99550948142.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161086e12a364a---rupanunidiparuta.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/218dddba8ee447078f5e41e53c5f4900/fozexejupuzabopaselo.pdfIn PDF document text
    • http://ghnservizi.com/file/tufilinuzu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/99218661232.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16206074870331.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/362e1afc9906bff502cde9cd45d836d2/fopukafovapumuv.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/63034537564.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/12be9c10e078c78f08f992ff06e2c484/morenexupulubuxini.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/19/81445998705.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/loxorupuvarerus.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/kitoloputozakuva.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/mitanenipebonug.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zodibidamogulafukig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=saacke+boiler+manual+pdfPDF 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_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 10924 bytes
SHA-256: 703fa811f5f48a819b24116014979fd2a8ad2c9a47410574181a88ec7548bbaa
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17624 bytes
SHA-256: cc71c81693e149bdcdfe776c33ebe2e7b9677301a91c09b5a2dc025ed32f88ce

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