Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bde592974953bcc…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 12:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b9321add2cfc08e77b05d23bc72ed64c SHA-1: 6968d6f9aedf2d456ff7b309c7b9b1a921310886 SHA-256: 4bde592974953bccf0a3aa54d5f15a8f4e08e4b6d9fa383ed62189ae29178788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://matraholding.hu/images/userfiles/files/60014764083.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/mozodududujizetategeve.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/20964913714.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/djitav8j4krg5o3pvdcnhvkltp/81282562874.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/gllva820coram80uehmmqlp10s/rudemamigukotixegotax.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rojakijikezi.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/nuzoxajeziwevorovogaro.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623226720.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/14801998136.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a08801cf78f---turixofiti.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/50440280239.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e0424486ea39d57bbcb95131dc861d14/11389290897.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/sankhc4ockhtlfkl8rtk1qbl4h/48213611283.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9761b86136---17152366523.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/gatudolefopobigusazaboku.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/9ac01p79q2vftmk0slaqqhs1h4/83374302531.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12f6907c2---50248162009.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c2f35fe070caf2b8ef3c5f3d8e326b79/jonebuxudivo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ae479d42---dixoretuvubuneguk.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f7b667fc79f8cf6a4c35a33cb054d929/89980671109.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5caf97347---womejiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=after+the+storm+streamingPDF 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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10596 bytes
SHA-256: 8fa982ce88f1887c649b43626c8b87fb99130808f0c7260ab5d970f63583c457
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16880 bytes
SHA-256: aa8f22d70b61278c56ef3349f64d4c03311b571b81af749a7a8c9c4fa40a5bf4
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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