Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f30b14c0afc9144…

MALICIOUS

PDF

79.9 KB Created: 2021-08-26 14:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 94cbe019bf3caea1d6322c881485e540 SHA-1: 8529cd6cf0e5bad403a713bf2b9d4dcc8c7d9f47 SHA-256: 7f30b14c0afc914492b4011ade0cfe7be930eef0ba9ecf35f8424a289bf22aa7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic indicate a strong likelihood of malicious redirection. No scripts were extracted from this sample.

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://medvor.ru/uplcv?utm_term=nothing+gonna+change+my+love+for+you+free+mp3+download PDF link annotation
    • https://nada70.org/userfiles/file/85143232622.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9604fb---sozivimel.pdfIn PDF document text
    • http://teifsepahan.com/files/file/wibum.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/latadotaf.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/42431755481.pdfIn PDF document text
    • https://melz-feu.ru/upload/saxorogekunokujosof.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/28e0affd63d083efc1fd78cfca6bcb7b/93372299132.pdfIn PDF document text
    • http://emannsltd.com/userfiles/22865355617.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/77600250374.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zulifexivutujugilinoja.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kikakuxafofaxugasamukid.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/movatoponumevekimimilime.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b290a42652---10809009626.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765756b6e3c---fanobuwa.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/000be229831ea1e4e0196db0d8d55a48/daxovek.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/67922819058.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/64512996485.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/rfubs1c0nu19odoaqu63h9791r/zotodajiniv.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/78754163356.pdfIn PDF document text
    • https://samtee.com/admin/images/file/89081907077.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1d2973aebbd9cc342ef1f0802ac4712/wikuboje.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/1392020117.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef15909d9---somibewewoz.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/waponunenulazogazavoxefu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pv78ova45m4auq64d7ccm4remg/nemujupujubeka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 26184 bytes
SHA-256: 0d5458a99423ad4283ae2eaf86398443cc47f625e4cbbb60755553857b416deb
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 11412 bytes
SHA-256: 86f4881264b82b53ac58be20cf25c58e6c82be6370289fec1ec5619169ff2d78
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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