Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce55f5de58532f6…

MALICIOUS

PDF

90.2 KB Created: 2021-07-30 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff521f57a2f335bed6a01b1db97b8732 SHA-1: a9cdf00ec00639f08fbf6faf74dff90704a401dd SHA-256: bce55f5de58532f65f4528be127ec4ec3e5b714d7aa172c71ded338e6d48aa7f
156 Risk Score

Malware Insights

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

The 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 WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://archism.ru/uplcv?utm_term=plant+dichotomous+key+worksheet PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3d6d6dfc76f90c03f3a231d40ba0b488/71529270367.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/18077141223.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b428a8fa4---97825236091.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hmq3u0j3fenfkkhu78r9usvel3/10166595097.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/datetugejevibikejuwip.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/jeromobitowezizit.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a8379287d42de18d248723c6b14c55a7/jusowebamulabo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gkr892368u55r9eaf2qvsiotlq/13164146014.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/53157f73d51db8b939c378709cca970e/wujuxifeluruguwum.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/fukopa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c45f161---fivorasegunimedapavaxawud.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/aba0af36a362e310768f313ec3efff04/gozinorifununinavibazif.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5478f0ba---pibifajituf.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/55910558719.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/16584632652.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sjrgma2vthh2jedh79i133hb14/pugulasumamononapevojoxub.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c495991475d---27872416632.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0048638c0b---zowutejobanigixidula.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/dedawijaxevebudutak.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/jidun.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/22443329539.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/tanapafupisokafedemedur.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11520003674.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607797e208c97---81543420389.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/zexavepexato.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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 11028 bytes
SHA-256: 9b322cc3763e26cb1e9ad97bba0338e785117e77237906447bb39a3aae699eb5
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 17312 bytes
SHA-256: 2153a1983fc8aeb34740bdbe063bac6e86ed415c2202452d6d267f3d6e5d4d1f

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