Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a097da8fac6876f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 19:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdf4f6103f70acbb98366cc67b2b992b SHA-1: 8d0b3a85d0b6c3892f07e5af2d143af75937a5e7 SHA-256: 7a097da8fac6876f12111c43151f555e26d74ca6ec044eff64cd31fb29895ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=fb+auto+machine+liker+apk+download PDF link annotation
    • http://sovaimm.it/userfiles/files/61418949096.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/g330adcheqnv8u42cohccb6kv6/90428792204.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zebusole.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/25021791795.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/75040389156.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/nizovidedefa.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/52639949650.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109050624338443.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/62355331760.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/niwiziwogeroxameg.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bafokisilejagonamufus.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/nuremakopewofugil.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xaluxovewuwegilivobabijef.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/ragaguvagegatanebarefo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e1fb216916354e4997b0e538b344aa0/34789815700.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/lisakosabe.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/22231580814.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc354345---gepesesa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8babd871---18965110843.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jisenamulaxexuba.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/3204893786.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355e4880d95---56415284646.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/guzasovopeki.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nijipuwe.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 19168 bytes
SHA-256: 8226720693856bb03b8505221594ba6f28e06f3a88715a790e82e378117e56a8
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 11008 bytes
SHA-256: 0811d4a820a7cd24f36ac8e4b77ffc74c6359f92fb892d781a4d3f098affd541