Malicious PDF — malware analysis report

Static analysis result for SHA-256 17695c5fda08d783…

MALICIOUS

PDF

88.7 KB Created: 2021-09-23 10:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f024a170d2b4330115d5434b7ded6ff5 SHA-1: aecec2a30ff6e272d6273f3d0685bcc8f8b60e4f SHA-256: 17695c5fda08d7834de31483dd907fb924db1dbac261ce373ee3f0f86b9519a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating the document is designed to redirect users to potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=passengers+2016+full+movie+watch+online+free PDF link annotation
    • https://sdhouse.info/ckfinder/userfiles/files/75627634251.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/tufovusalomibegijafa.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/7329837349.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210902072432.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/79540567894.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gifv9os5apsff0pr07hfimeh55/37990600937.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32654118487.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/50540088728.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xozutobamalugoziripa.pdfIn PDF document text
    • https://kulittelor.com/contents/files/1182638073.pdfIn PDF document text
    • http://kodemari.info/data/files/11635667588.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/kotobevisupivir.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/85085239241.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fafavitigun.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/37279446749.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161373fad86fa0---gikofuvewalaf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c0bf024---94463042806.pdfIn PDF document text
    • http://besteva.com/upload/files/tenagipogir.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/jewuzalikamuxaj.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/timesub.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/15078165590.pdfIn PDF document text
    • https://dacola.com/upload/files/zomugopulifuzu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/koporedor.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://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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 17596 bytes
SHA-256: f6b0b64d1daaf737e5a2ee46748ebf1f025b1c7633018f099b8cebe5fe979e8b
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 11500 bytes
SHA-256: 5e377e18c981311d83465f5117a6a7fa033ba1811ddc69b762bf628f65e3a88c
font_02_sfnt_off00014213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1