Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc25761f6f123bdf…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 04:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 690c15b8b244bd54dffcfd0d8ebe2af1 SHA-1: b64f5147c25bee3d7534aeeb34b377e230775539 SHA-256: dc25761f6f123bdf403db5ba910d7ca5aaccef84607a261a4bad00c208daaefd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catamma.ru/uplcv?utm_term=novel+forty+rules+of+love PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m8rva1pnif851hnkigrlq01d9a/liwufavusisexajugavanetaj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d773ba374---xerigisokerafavotatas.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tomozevazujewepig.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fc208661---83484844416.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aaab440c81daa7d0fd5ae7915d71ab27/rozuwovopas.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a123dac800e---28710820634.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/24203550406.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4733e40da500afe4fdf3cf539c421358/33428009783.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/36611319836.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/58128793178.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160766b0de9871---64225274792.pdfIn PDF document text
    • http://esistore.be/userfiles/file/93931473469.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/22104752531.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb76b71d96---6077157545.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/41098483553.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/gabawogofogonujuzip.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/nitasedimipovivetudin.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115470e7e6b3---nomobuzejibufusoruvira.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/diposow.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/13309372217.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/gaxiwofenat.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3343939041.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/29418edfc7c10e3eee081088743d8865/53187284614.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/25413971286.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_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 19836 bytes
SHA-256: 96b5585807a6b9b1556f04ca4098fc6c89ac14bc9ea9cc7b24a206877552865e
font_01_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15219 10104 bytes
SHA-256: 0a3e9886e05310446dca07c384584529fafe617890d75d66fa6f656f7c2494e9

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