Malicious PDF — malware analysis report

Static analysis result for SHA-256 573cf0383b621045…

MALICIOUS

PDF

92.9 KB Created: 2021-08-05 05:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 999c3c4338c45e50289496fbd0a11502 SHA-1: aa3275bb4984fa99de06adc0771d71c5849e1d93 SHA-256: 573cf0383b621045b687e9592400634a60ed3eab7199fa1bf4c5e8544e9790c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8382c6fc31394dc1457be502e65c06b1/62227068355.pdf In PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/96028055807.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/830fe053a9f90e080dbde165e07781db/29965541534.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/48323218575.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/wanalugafesimarobipu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d4746d2aba77356e8a4861f5d207532e/balazusek.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bd56e7b17ece4b30d5bed961c5d4c728/24382862338.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/44439276001.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kebosifatotarexupufup.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210717_6FE9B5879FEEE186.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5507735a1---kanuwud.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zanozuvexozodiravutag.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb69bb9e8---3014354429.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ed83f84a---18741612164.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xixofujipijir.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8fe993d6---27207735549.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/rowev.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/dobakotewesimulukofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4d347c3c---pivojinenenopigeputi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/17314760440.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/jeduzowepuxajikozazen.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/44e970db692332fb6c210f0804fd9661/31088466136.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/pekozuzenolepevobamelo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cdcf2c89---jomakewupofosugelijobumap.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/46393033650.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/18916988296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+determine+value+of+vintage+collectible+marblesPDF 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_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 17008 bytes
SHA-256: 9083811443c01117069dbfd8d133fb2455bf9b7a5e7267f7a6dfb42c2c632297
font_01_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 11200 bytes
SHA-256: 0663989c1f108c960931d523c2ff75891303ed8ac67839a0a35c3f71d8fd534f
font_02_sfnt_off00014de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1