Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbea305eadc43dd2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 13:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf29480e8da3337753868eed3e823450 SHA-1: 7fa4ea8805907758c93757e486b178aa3edb6a7a SHA-256: cbea305eadc43dd2c7ed153283997dd1394146f03ae530208b942588cd137872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farms indicate an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=volvo+touch+up+pencil+manual PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d4ca3e14---3509370129.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52365cd0e---sasegoxowufobavuwowikim.pdfIn PDF document text
    • http://falerisztika.hu/tmp/bojik.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/28193219263.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/97031173530.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8a3d6f7f6---jemuzadurojapudumeges.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/011323008886.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/zomiwapes.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/xitogifusizulenevivov.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/59821664452.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b17ae2dfb---9809607724.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9035f2284f663d07bbdb6cffe69ae284/birowosajaf.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/66356283444.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd46f47ab99---senuruxenomo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b309c8c2778---kexawewakojutubivos.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210809_EF2008EE01090A1A.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f49f0cba368---fumaxalawewudonew.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jotidozegitukesaj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f560fbfde5.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/difafupefuxedarebemodavu.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/divixitifemigudixixi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0a23ab70---48584496073.pdfIn PDF document text
    • http://www.bandungmesin.com/file/31958733013.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/14489150945.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10508 bytes
SHA-256: cfcf4836b60591058720a6ef00fa906e84ef82a1b0c0b2d7751e98a65a217327
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 18108 bytes
SHA-256: 12c3aa0e6e12f4bdafb73460ce63465629a3f1d0d314937e70f36a27d611ae14

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