Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99f5f7057abc002…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 15:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97f2d3a438b47e58ecaa777b6a60ba57 SHA-1: 6f61ac2078170ae3952aff14f8468d4ed9a942b5 SHA-256: e99f5f7057abc00281856813a52d0ff0a89787d645ac13fdbdcd8b1e37ed9420
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 external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://queure.ru/uplcv?utm_term=igo+android+cracked PDF link annotation
    • https://lotte-ppta.com/beta/assets/file/vilujajeju.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd468c2f---42466515048.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/lobejazojamixamonejonu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06e0097f---vukefana.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/30340197511.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/35290375473.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161484f534a844---nejudod.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60418664741.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tegemosolopu.pdfIn PDF document text
    • http://come2menorca.com/images/file/sisusesomedokelidejaf.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/81616257961.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/xemaguxulepukab.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7333dd74---rarogepowaxomu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2geu128hdmupgmcambavi189a6/lewobigununozedosavu.pdfIn PDF document text
    • https://nomortiga.com/contents/files/39043927988.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/76202255812.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jodofikeralatejuto.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/datokagodesolunar.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lowuxofediguviku.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/35681494121.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140eef770749---wijipodotanopidu.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/lojamanetajebolav.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210926133105.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/68306439086.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/41137407873.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/wakaw.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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 10276 bytes
SHA-256: 6f5dc641a8ffc432a97ab7c59345a9aa393c47690bc91c04c5079d91ff36271e
font_02_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 17248 bytes
SHA-256: 32fdf51c26e055544eb75d1ae1f509d74fa06f6897ef80f548526e9100eed16f

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