Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f8920c350a5971…

MALICIOUS

PDF

106.4 KB Created: 2021-06-30 05:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0eef4451933a69444d198b94b18bd903 SHA-1: f6d7c6e03988c8edd13ddbf36ef24f459e9c5b91 SHA-256: f4f8920c350a59714d38fc070c602f45cd4e32c4542575d5ee1e3bbfc74e0036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URLs are indicative of a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://pistant.ru/uplcv?utm_term=permutations+and+combinations+solutions+class+11 PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079491b4d3a7---zejisoba.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/huaqfdq0ide9ntavqjnt57vh8f/likerebemegifozuledo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6ce8223um0rb57jb81cm42fnq6/15643153483.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6bb03899---28771226813.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0q3s016p0sg5mfpi59rqoa2mmf/65206596959.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ufmsmg5klhjqspnmr0de7hbbbr/xubuwezoj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609860002e166---41969798276.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/51966107385.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/38724105038.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85df2b5453---95458299867.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7322d27084509039a34ccfad0dde76d5/vidorekudolepuwuvugu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/56964680082.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/legikomusufos.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/lodisaxulosiwano.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad0855679---vapotusukab.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/82149018054.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tolipuzuletebagokunog.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c9612581efe179a64013195f8bbdaa2/sesopexudoviferijisar.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xumexigixixir.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/31567413496.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6d47923e4---14300186512.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/20197114378.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733242ac985---94203770457.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/badak.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 17816 bytes
SHA-256: e2d7b96d8f2e48019397f6b770c7bbb07305688bead227b9c8c36b64f82d8b5e
font_02_sfnt_off00016d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D52 10824 bytes
SHA-256: bdf1372f3c86e8e52cdeb2bbe774a5d15eee17d2fca21fa46ff78846504bfa7c
font_03_sfnt_off0001864d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864D 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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