Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae5d2b4e816fd6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 11:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffc884a51542ee36f5ca262548fa0bb7 SHA-1: 8d0b3ce9f67c3dd1cea4f2b41e38c0acb2ce4533 SHA-256: 87ae5d2b4e816fd6fbdb179708cb512c3c72024aa770c2497cfdc14bfd8a59e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=apk+smtown+superstar PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382b44ce832---nupakenuxofabodelojabok.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17242628237.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71768532946.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/27367427563.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sigemekinuf.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/kowatixid.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/kewozazadukigitefexa.pdfIn PDF document text
    • http://creationart.hu/files/file/37912533673.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/6294126948.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/ledatilozanu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/38516283262.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d4ed1f74e2d55f88e4b941a8f02e9dcb/xilixigifotivojikulevute.pdfIn PDF document text
    • http://xsteelstock.com/d/files/sajakegizelisoxijipi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375950eddf3---42971125843.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/fixujedizuzitoz.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/97020144388.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/jafapemabajavixij.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/17604979269.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc19b449e---47143872820.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zudoxawikuwe.pdfIn PDF document text
    • https://ms2oke.com/contents/files/11943052584.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e9f485d2---vemukojap.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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10532 bytes
SHA-256: 9054aefb65c228d86c5c461f6f70cf85b6a88f189b079229231937338db2d216
font_01_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 18580 bytes
SHA-256: b94a320589d8645f79bf09e748bc47e0f250ebb7c94e74a2f6ec9eb0121a396c
font_02_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1