Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dbd73500983016…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 03:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e081f846e18a4d39b8a64de40f07f5dc SHA-1: 0e580a211ab778fd421cb568666891c895ca7d96 SHA-256: e2dbd735009830165169f047d3ae64aa6b8dab75468e4ad7b3a0d4544c9ef416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/g0v96uepvc8742mosa2sh1edmj/vuloxalesuxedegepiw.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb929a1448---58207644495.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tebabinoboranilasawowojuf.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/24453918167.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0896a658---wataxuxonotoxujikedakasu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cdda32ad5d6c88f3288d8f0949aa3f07/29131970762.pdfIn PDF document text
    • http://www.depomatrial.com/file/dodexuw.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a1b5043d---kamosu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5vcik1tqt7qaj9l2gj5s1pnabp/91086971072.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/98149367967.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/sigag.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vorolujagakenoj.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/86910285050.pdfIn PDF document text
    • http://unseretochter.ch/images/file/vusujobe.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9eno4jvbdkr59qblhnbdf66e3/68702232163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=life+insurance+underwriting+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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 17548 bytes
SHA-256: 68ba0992ae28dd8cebf0edba07f79c15760e3023486a602c7ab6e9dce71302eb
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 10772 bytes
SHA-256: 3331833b9918743c5e423f82fb849d595d6723ca69cd740d7dd991261b005425

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