Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5e0d1743672267…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 07:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3dc835d8b6ad7982c89e73ca4535d79 SHA-1: 2697f16484d7e0a504be29b8fba0489f346a4c67 SHA-256: bd5e0d17436722672699abed99089271fa8c9c81bb99f4a7878c045f84623843
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document's structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://zonwering-nederland.com/ckfinder/userfiles/files/99934866400.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/47f90498df62d8be4e8cc8e61682d62d/68236766467.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84671073778.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/50002621424.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lefiwazudebabupab.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/xekevufidukupojifuvo.pdfIn PDF document text
    • http://abnicum.com/files/file/tapabam.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124d2628b4d8---35476211623.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/kokewufeputarodu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e461fdd1df7---45462214267.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd35c530f9---badilirifewow.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508112336.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16103b3afaacfe---83554395007.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f8d8e157---47725745452.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/94120032213.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m9g19ggki1l3ml76pcu4t693q0/51792894029.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92699399---levaju.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/88811757135.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7116c66cce---80076730910.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ec6e750a---vafonesafesejakumorej.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/67518508798.pdfIn PDF document text
    • http://ddp-gold.com/UserFiles/file/27388118776.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/65f145e804b86b220d3376b746a8c4a8/pirobanuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=natural+language+processing+and+information+retrieval+pdfPDF link annotation
    • 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_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 17244 bytes
SHA-256: 2f285b21ece29c7bcf43d60d7e717efe46e061ba4492baee23e351502b28b12d
font_02_sfnt_off00016071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16071 11108 bytes
SHA-256: 672b9d63be67674a259c61bfb91bd367e1b9fa2a8e0488ef88820b4437707f9c

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