Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b479e90c71afa3…

MALICIOUS

PDF

101.3 KB Created: 2021-07-23 11:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 86094a742f74da307d2bcbd89caf501d SHA-1: 97a3dce433ce9095215fb5f6d8c3a0ca584a5d2c SHA-256: 93b479e90c71afa3afcaf4fccc7bbf09d067c7c477203daeda88e393e6ccd7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6b65bfd0---55901549924.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/mepawuzoses.pdfIn PDF document text
    • http://talleresjpg.es/img/file/33089737105.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83c4ddd7d---pidosejuworu.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/23940166602.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sonaxaxubopivux.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/42286861912.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/51028779728.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/15558941913.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2b8d594b---89627604739.pdfIn PDF document text
    • https://jurad.eu/files/file/pumitopibij.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d95c5508---57451604597.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/31d2523356012db1f4b8d39be7f5c7d4/paperazavotijevibume.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/girupavupe.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/22723392398.pdfIn PDF document text
    • http://etimes.mn/uploads/files/2891529620.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8042e6a8a5031500be617351b4209fa9/59892523253.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80cc548d1---80459108790.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/76fbc9a159603d0e8a7ed0e832863fd6/jomozobasixezesiki.pdfIn PDF document text
    • http://centrons.com/uploaded/file/129882666460fa48944cfc4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=handwriting+identification+facts+and+fundamentals+pdfPDF 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_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 11140 bytes
SHA-256: 42b6be27e44f9d8f6103c75522140aeccda030f7a186cd0d7da7db036cbb0dc4
font_01_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 18156 bytes
SHA-256: 69cbeb4bf5b19300b82077065a930c88c946b8327f4b93c43d921fab12fcca4b
font_02_sfnt_off00016dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1