Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0dccdf94b82ea0…

MALICIOUS

PDF

96.6 KB Created: 2021-08-16 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18b644dcde668f2233e18849e100059b SHA-1: 4c800c662c16a603008a504a903cf312d8a58458 SHA-256: fa0dccdf94b82ea045665d05764cd38b5cfe885188d79bd5c03f734c000673ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/38eeb1b33c155534fa8bcccb887c8585/daterugisuxirubefun.pdf In PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/29764825903.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f7beaedd---33792434084.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d2d16eb34fcc401e9efdff9a0ac56517/vatenidemedinimurol.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38668104ba---vagilevaketevojus.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/gibuxenepiximijinaviran.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/396efd3294593e18622b7fdd4e764466/nawitegopubijexizum.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/zemamepadufasigetevuriko.pdfIn PDF document text
    • https://hirurgija.me//files/sipezitivowizoduvoxus.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/29404314493.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tirawuxija.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/02f74556b89ab4c9e3606becf56916c0/nifomo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/2204129590.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/rorati.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/mikesunepazoresonojuj.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xafalurolanemusenuruzafa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ee1cf67e---sonikejesozefepa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160836dee130fb---76346989567.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/034ca87fc0a941cd1e48209164a3d23f/soxegid.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/1492485568.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jopuruwiwafagu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/55768408305.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879df054f34---32860430995.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/06ca53a99f124e927e60c37d53e0f4bb/bekewigumoxutufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+resueltos+de+programaci%C3%B3n+lineal+maximizarPDF 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_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 11372 bytes
SHA-256: 8b75c62d3c1f2881719de95ac9c6f71d59cffac465ae150e65c8a82433ed06df
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 18048 bytes
SHA-256: b9f01491d6313bd45c4f0b9ba773bd92764671598cb047e389e8d3a1069373b4
font_02_sfnt_off0001586f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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