Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea9730a8ea0a6ff…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 02:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 650a4bd049b87d533c4c431bfcb2dc83 SHA-1: 6e56874bff4462017eb79f4e7fcb584b1dddcb11 SHA-256: 4ea9730a8ea0a6ffe09d291b8e3fe363cbe6e1f6d5ffb4a7e0a2fb9dfe113ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to direct users to malicious external sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=tax+rate+2018+malaysia+pdf PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/rogawojakoranutivuro.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/27382014.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/79328900500.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/22116332591.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11956db43f---fasuv.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0f75b811ca8d54583311f068f8d70461/17014597781.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/sokotubinifomujifu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789c8c51ee3---vagag.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/luvomumitovon.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/dirarotunaxokepukutuxe.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/174d1bef4383c646515e477abe5e5852/86481027284.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fd63388d---66290853461.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9rtqeqk3ad5sase1jsd1rfjjq0/ridopadoduwerugonosevek.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/84984303042.pdfIn PDF document text
    • http://allasclub.com/campannas/file/desipadifepoxekevifakiz.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/koturenenuwem.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/53720147650.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/26273235393.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13377681be---96125144006.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6f62392017119b2fca28f5172cb46f4e/jiwokujurikuzuvuno.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/88162897657.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/38401681839.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/pakibubumipew.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vbldtlb5065el9o55oo5m3dsn4/kisiwofedetifi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 11116 bytes
SHA-256: 715f9f6de9da57bd45683127a3f076e937be8660ec8be56ace28166fb7fd34ca
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 17720 bytes
SHA-256: 7c91546fb0475ba3fd8cca04ac24a9a774594ce46a2316547d44791a02f71ee4

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