Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c6f0a5c42cc0fa…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 07:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fba7b69c070a8aec00aaa65cfb22f5d SHA-1: 6835af8fd690c54fb7ee170b6181d69789540ae5 SHA-256: e9c6f0a5c42cc0faafa260c28d886bc1a473a3af6cb2fd9d5d6c9dd1a800eef6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted from this sample, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=live+game+streaming+app+for+android PDF link annotation
    • http://mariekevanvlierden.nl/survey/userfiles/files/60702777139.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/20492654168.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tojuderubexudelugedi.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/dorenagadixajajusila.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/57250673937.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613882e01a4ac---taxonejebowagag.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/22731831183.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/23054d61bc31381fb50505984f959dcf/98220384417.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/23653750098.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/nabulelonomonej.pdfIn PDF document text
    • http://compsult.net/userfiles/file/22880360716.pdfIn PDF document text
    • http://i-dron.cz/data/file/soregu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0c11ab31---51307264804.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/tevamorajeweraruwomovima.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a8a2c4ce1244880f4cd640228e1b8ce6/98025215534.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614313b611cef---luwulitidonowef.pdfIn PDF document text
    • http://njchemland.com/upload/files/78520198212.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/23511483401.pdfIn PDF document text
    • https://fishboat.hr/files/42835556091.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/26971326743.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/72985166875.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tidipigijakawoban.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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 10816 bytes
SHA-256: f4bc23881822f8ea3aa2eb086d06119ad5f59218f2a36878f585304d80761aa4
font_02_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16800 bytes
SHA-256: 5372220c125b1340be96266fba7d214321593693d5d0dee0fd70d8f6e7a7e5b6