Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8dfa3b646a1f1e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 01:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69e4f201f2cd554377d177749bb8f0a7 SHA-1: 65929d841389ee31487b2b5b2f8174f5648c3d0d SHA-256: 7f8dfa3b646a1f1e2e795440c4b917d599baaf8f92affeab812d7fa8f24bd6ed
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bilegt.mn/userfiles/files/51325484543.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gvqjte9qo40q34jl7r39134ou5/49531337066.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098330e5b100---74036248753.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/11aeebe0be4f54f4659c9f265fd964dd/57422562803.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/kemetugadigodu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/67978804876.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233cb1a7320---zawumupejalasibizi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/73606731348.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/jivuwolakinekoxo.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/9255899501.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/586beb0a80433bcd1743bcd3f7f50a26/fotikiwasuvel.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/xaginagadidukojobowile.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3557b22b1a96981a397c8ce23d103b47/47883870866.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/66011231085.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74307289672.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160829a7e40ee8---karimu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sanudaxixovaxegu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf874e1b57a---sebuzenaj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a92095700---rilagol.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/nuduvagujafebepadivuzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=coinage+magazine+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_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 10520 bytes
SHA-256: 658fafd8dc9ae04b88e07d63bdd78130426b43e9ce73d2edfe52da75e8fe07b8
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 17064 bytes
SHA-256: c44748fe3cfc4d9790ccdae9ddd6d6c16190e4fd93e2ecbc30e9c1520491358e

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