Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3bfb756cb58fec…

MALICIOUS

PDF

83.8 KB Created: 2021-08-08 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7d9e7989cc8d50e6d1f2b4e31a18873 SHA-1: 910a4ef571a4c6f97d2da01e8a6599b8da7cb5f0 SHA-256: 6a3bfb756cb58feca8c8dfecd66a2bbf43a386e9ce7956ebb867f4d907b9589d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure indicate the primary goal is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://emotionpicturesfestival.gr/userfiles/file/9112009474.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b95ee61409985d2bdf006dfca371514f/18111033618.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/33925358756.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/numhtnipe8qq18jtra2ifqcncd/33247787836.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gabegagexitizubazo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a25bc265d4b889f838135d0496702026/wuguxe.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/regonomozewerilab.pdfIn PDF document text
    • http://blueyee.com/upload/file/212025079760.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///11834706231.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/624651fb13fea1b5d71bf58d55566c42/25273745114.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/21984842759.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c602ac295---gubojexewuvoduxudukuven.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/jorinuraliripagesixo.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/dejovexavapiwixigonovuw.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4b52724f0b22d98bddac7e97d6775726/91441416523.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ec671347---fafunesoxu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s362itl7kskr4kj6aag6kqnrd5/28509782071.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd7ce43de---kasogelifugezufaxafa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fuvenixanonuvaf.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/jikamaxot.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c0bf01cc64c65e16c641b8d8531c06f8/lajanupefomalu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9c0ef18aebc556e4b371ac68fb2e2831/20351952346.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/93115c091072328da048ee40cb7cbd3a/nobobilanafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=youtube+mp3+downloader+pc+windows+7PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 17088 bytes
SHA-256: f93640ed99ad34abee7d7cc886a266d92d746915968d0ffa03fe0c8049befee6
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 11204 bytes
SHA-256: 0234db3d0f623859547b2de5f2cb6d557b10e05ce090604d35e70e8eaccee7d7
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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