Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9c9c342138eb0a…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 22:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 471af804fe3d4456209c26f4d2bb3dda SHA-1: 9d6ac84b97b760210646ce5f6324f5a538f53475 SHA-256: fe9c9c342138eb0a8a12d8b00c263c9186bf2c7e0d5c2d242453d2ab5e404b82
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=stylish+name+start+with+s+for+girl PDF link annotation
    • http://kantipursecurity.com/userfiles/file/63299837600.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sosuvuguv.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gasov.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb0742e6c---31434675368.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cb912cd05---pubalol.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/1233942730.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/25852863701.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109290527525796.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/33533200192.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bepabo.pdfIn PDF document text
    • http://wmsone.com/eimages/file/63935828914.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0p9q9hj4dq9mvda956ag415s6n/kafuvamezajibarise.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c76b1b3d72c97cd750c823deecf486ed/33963302825.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bazeladenupobam.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/77391578985.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b1io508lcekhbminam221fsc87/97519834553.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/toradulevizusijox.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1fca1bbf7394b4b397bb8417680b7580/75631606660.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/16/24372268843.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/66595604894.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hipa950ob7idfevtcd37kquluj/86865150355.pdfIn PDF document text
    • https://semut73.com/contents/files/40368684829.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/logumokitefux.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/19185272205.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/zasubobeluxedub.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_off0000b0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 10936 bytes
SHA-256: a05ede8faecbae6abcd3500df982e1d4086076b320fed7389ef81ddbf5fc8f98
font_01_sfnt_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 14448 bytes
SHA-256: 79b49acfa751584ce178f5490b0274015caaa38e10a557e98d4029e710d3c12d

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