Malicious PDF — malware analysis report

Static analysis result for SHA-256 5231dd2b198fe689…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 02:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1686246ac6003c5f0d49d50e32715374 SHA-1: b6bd70a933d1760f62b374b86a86098c4189cfda SHA-256: 5231dd2b198fe689f28effda786eb2023ee2f802596091141406b0aea761b478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of PDF link farm heuristics further supports the classification as a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/83478278486.pdf In PDF document text
    • http://www.grifin.sk/files/zogedaf.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed199bb088---7238848791.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/butesimonamevir.pdfIn PDF document text
    • https://producto.works/userfiles/file/zavevewufujufede.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/boturofu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134edef36db4---litojazefozomusamesekimu.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jozifakoboxixakamemeg.pdfIn PDF document text
    • https://ibextrail.com/editor-images/32746683455.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/vetanisobilajowavuvurex.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45fe04694---tikufak.pdfIn PDF document text
    • http://vhz.cz/user-files/jowifiruponuduvuminulu.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/801cb136d5dc1871d804bf638c8fcb10.pdfIn PDF document text
    • http://scpt.it/userfiles/files/98209077085.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/tisuxorifemamon.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/ranedemopatabejasi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8242df68b---98010381846.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/ziwonotukibasudizemebox.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109050349585512.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d235cc029a---vedidotulosupe.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/33836040977.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wekapanikizaj.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/80336332426.pdfIn PDF document text
    • http://paradoxine.com/upload/files/20908933745.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/8850774685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=geometry+dash+full+version+apkPDF 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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 18064 bytes
SHA-256: cbd5361f9c80312bc8cd10c4bde07a95739740018cec18fc58b68e76a0787f68
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11172 bytes
SHA-256: baa0e648d273583f769ae149a8cca4fc3344e1864ad8b69736092c4e04cee34c
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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