Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da6dda98022d457…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 05:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a2ccdd0e8b59db496f1824902e253b6 SHA-1: 3858e0866cb5bac40203329d78793bad135abea8 SHA-256: 1da6dda98022d457a7cbb215362bad87fcfc4cbb4dfd0f7c2dee98bde253528a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of disposable hosting suggest a link farm designed for SEO poisoning or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d609f483d2---47896089849.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/tawatusora.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/zikugedofopugej.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/64048264328.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69ce7c40e3f9656219389dc118561c50/69380913826.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/41d74bbd857b6bbe9b8c836a7abef7bc/vapot.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b89d9b36---tamaluwoxu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/74412435580.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/bureji.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9352dda0---36348132084.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mamaramap.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/05dfe1469e5cefe39dcdb6e912c420c8/doragosanipomub.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/jojopumazak.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/73569037818.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tegepekeni.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/14339838487.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/89216127972.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba53a494a9---matupuwo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/70383362980.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b27348105ec---megulusigagikusojexetasu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/papisobesobugilanumu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/susega.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/luzaroxajasegobomusop.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/wekut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dental+caries+pdf+bookPDF 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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 17836 bytes
SHA-256: 32b8096df7f23ffa62f27e35b8e28fd10f9095fbbdbbd04ef8cb28694ea590e7
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10848 bytes
SHA-256: 87070676e286cd8ccb8ea896c5e96d84885a0bd0a3b0e7ffe3476ecb3ee21f07

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