Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b25a700b1e6521c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 10:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63cad5900f09f5a3649b51286c7ae293 SHA-1: 1754a97b4d9170f84c3091e79dbd9d2197d82be3 SHA-256: 3b25a700b1e6521c11643e95de4450ca125fb66aeb5e84fe296ed8401b4e0276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is unreadable, but the heuristics and URLs strongly suggest the PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=poco+launcher+hide+app PDF link annotation
    • http://ud2-140.com/files/6001651662.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kiwisukazovamolibodusefob.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/fomifumululupivumesizin.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/medevomabeg.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33a143b58---nizunetadabudelada.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69437226711.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/beneleronox.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/biwavupa.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/87879882172.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/27359716152.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/jopifowemababi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136212815a43---gisurimobabipirof.pdfIn PDF document text
    • http://air-ned.com/uploads/files/1988786509.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/db3b60332053247ef2818e02b6a3b9ba/78080134543.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ff0d1f56---popiluvolutujito.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141359d92f70---giteziruzasaduga.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/soxosagetimupopaton.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210914131210.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/11907831520.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/44076286976.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/50278693821.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912045949676653.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418da2dbcdf---tatafuzinamipibazi.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/mudosufulifalosifoz.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28008699516.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/lopojisebipokurepad.pdfIn PDF document text
    • http://acelybio.com/upload/files/duwudapuxerezane.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 17148 bytes
SHA-256: 3d9da80a5f3e47a0d702f7d2f33cddb4540da06c1df7636c09980a5c241814c5
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 10444 bytes
SHA-256: d13b9c85a30b6e8b38ea784032232bc3aa71aa5d3ee163248351c763dba83fbd

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