Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ea0dbe30e5f545…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 14:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb99f477738f6500b3ff42fd4e48a39 SHA-1: eae51c443d4f27392b0e80386397bde90bbe2782 SHA-256: 83ea0dbe30e5f545e2f588722e985d1d39dd16f78409ed6ca9fc0f5866a039fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users through a malicious document to click on links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0c9e350e---21154412488.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_21A7DDDEC77F8FA3.pdfIn PDF document text
    • http://xhzhengli.com/upload/32178463692.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/2278374769.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/rudumagipejepugusopu.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/rojirigosaru.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/19436472363.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/27458417209.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/lapesepaloniremije.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43722240e---rabafivefujokovefiga.pdfIn PDF document text
    • https://airshow-bg.com/file/suberujesolixedupar.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/88235479773.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/56525278370.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11058235356.pdfIn PDF document text
    • https://digireg.ch/upload/lufiwefuxeketuwu.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winejonul.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb1dc2ee3---zisadufemoraxanudexubus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f335428115---limepob.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/nowajesuvelaniru.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zupekananisaxapepukawuse.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/fulixuzedobalawabikufir.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d09016775---36707516694.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/44083018967.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/kovatula.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fudativojodapawepewoji.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/masejitudenavis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=paul+johnson+a+history+of+the+american+people+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 11228 bytes
SHA-256: 55e7dd3a6e27a928b3fb526e48da29339797e72a46ee6924fdb3928383dee576
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 17352 bytes
SHA-256: 9bf1c9ca93865c8eb3189b036645f23a086d898890b9dd2014374d62adfcfbef

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