Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2c37e8844ad2b9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 03:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b09673989fc14e6db667d7c7fbc2027 SHA-1: 5d2d5246a62741a88f7df69af808a1a7ce99b9f5 SHA-256: 5e2c37e8844ad2b9420b27abe518c7c0523d81fd0ac89e52619bc238bba71d5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains identified as compromised or disposable, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=irritability+in+biology+pdf PDF link annotation
    • http://www.medicellbank.com/userfiles/files/giwutudisif.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/98267661651.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/gavixewisototofo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/59745839841.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/10505164604.pdfIn PDF document text
    • http://ud2-140.com/files/97396664220.pdfIn PDF document text
    • https://mollis.rs//files/32172466067.pdfIn PDF document text
    • http://pneusmarene.it/images/file/ratepixulunomexel.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/96858024304.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/61246465556.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b455778df28---66830755106.pdfIn PDF document text
    • https://ksboutlet.com/file/files/guxivivotil.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/debexitopuvul.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756d0c2396---kubupedose.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d824cff5---32966314131.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3a863693---feniwupufalomi.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/petiji.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///selutidirejizipanixovo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210528084547.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/bejurolomebek.pdfIn PDF document text
    • http://techbis.pl/files/file/vosororaroxavexakegele.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gepobuwe.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/68114435173.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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10580 bytes
SHA-256: 9beced395efa9b2bea3d35b0e777705926067be0f22b37f88ce1bd15bdab8b01
font_02_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 17556 bytes
SHA-256: a410fef4041c7969fadeb7c26e168c4209086f3502c4bde5304cc1088f5e3810