Malicious PDF — malware analysis report

Static analysis result for SHA-256 42101f82728fb242…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 08:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b4397795bdf5fee6f1efa4fa86f8f9b SHA-1: af87b9f092c2d16605ba6e4dcafaa96d5e3d4ca7 SHA-256: 42101f82728fb242da7599de1bc478ec7459f41101ada98b3f5cebc91054b389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 upload sites and disposable hosting domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it exploits PDF vulnerabilities or social engineering to redirect users, aligning with T1566.001 (Spearphishing Attachment) as a potential initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/854fb90bc8e995cead13ff040776032a/66522081292.pdf In PDF document text
    • http://tylincms.com/userfiles/files/junufovozemenew.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/faf4100b291263beaf18094307bcd91a/91063926458.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c79c953dd4737caa2a48a1dd239fde7f/57768464203.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/82161184368.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4f935fc3---68210888585.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/wakevekekel.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oo1e44jebjuq6m2805667unmt3/55693549719.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/66137258756.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/batovenukatojek.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c477d5679df---rufopukema.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/89185883585.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a91c807cdda6c4e3a5fc1c7d3b632a7d/28715450813.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/92895104454.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4fccf058cee73d9b64986a86b70e5bda/jibonivawerese.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vubarorewojopesidi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wodur.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/82146677530.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/24044325170.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074179e18---polalisi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b622ae9a4---62637081916.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xaxor.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/12982940649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=does+orange+and+gray+matchPDF 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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 17304 bytes
SHA-256: 201ac19dea40076cbf1983d6b3e51d12214e9af7cb260adcfe662e0afabbc0c3
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10796 bytes
SHA-256: 5b827347b1ad7077192ddd74c189e12a13f3741ee4a79bceb5615f79b0322c0d
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.