Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5514b2beabd3d78…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c5aaa3594d8eeb61a02db77ee3dd51a SHA-1: 2f99ddce8a1eaba3590d0a8b2258ed7dea8256fc SHA-256: a5514b2beabd3d787596554b24a1400d2e893ccec7f474890ad53c0af74d71a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=croaked+our+snitch+meaning PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ec299a8d---lonububu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/tejixadevexaxotemamu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b8f878a8---zozimejemidovewosaviguw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86ed2a5ed7---66912128942.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c313248c9e7f49448bccb7cd64126c20/rokom.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/27221539975.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c798f322---87094895066.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/zudavulutij.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86d39ba2e---76218106010.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/66115966352.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/77557070470.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/gixatasure.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4c477d9ac1fe6ed29782f400f0c623fc/rusofiwaseposasikudokufa.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/8578063589.pdfIn PDF document text
    • https://ka-base.no/images_content/file/29867551564.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79285574582.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9cc72e43---sulexipidimuzevasadejaku.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/biwenogutulumofegun.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/14605036208.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/da97939775dd79ccb31b4024311a37e5/69272621238.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 8028 bytes
SHA-256: 63ba971ac7dc5aa0fb457f8da984843ebafd77106c48d448da71d13a84b2c5ca
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 23384 bytes
SHA-256: 49119d599c37e28720097bea743384d9e121ded9b23c27ebb2b137569a227fff
font_03_sfnt_off00015b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B42 10996 bytes
SHA-256: 9b51f46eccfe47751626ac591b03af937368e07ee2637c75727135ac35918dd7

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