Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea60232a274fd21…

MALICIOUS

PDF

169.5 KB Created: 2021-08-16 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ce3b5431036ea1abb0407391325100d SHA-1: aa5bb88928605409c710dda490a5094e92df5232 SHA-256: 3ea60232a274fd2131ff39af229743424157bbc2526a4af9884f302797fd1b51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious sites or download further payloads, aligning with a phishing or exploit delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://brenna-ski.pl/userfiles/file/33280249648.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c78579pmratpqnt54km66vd6gu/najalikikefax.pdfIn PDF document text
    • http://altinay-law.com/images/file/27202933616.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/belukitozikuv.pdfIn PDF document text
    • http://webursitet.org/Files/file/9660560918.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/068156530eb88d2d58b09e600682721f/64219188871.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/403966e9652d7c89cc5fdc7f5f44a288/mewakibejomumaxekikuxidew.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/lesokikexodonebibijik.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/kemorisutenanimedidugumul.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610294b86a346---zokewekozanusefagad.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/930d796b4d12c5ae92fa22a227a707f2/51592201693.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://teamcode.net/upload/files/37258089554.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/nufurapewaguwolozobite.pdfIn PDF document text
    • http://www.bash.cl/media/file/zazofira.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/wifolitetefuw.pdfIn PDF document text
    • http://hydrem.ru/images/file/36205208672.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/gobupux.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c52de0108bf---mezasekivolo.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/mifevu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fe752d4f70cd3c83db2d996d42869963/6944196452.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6f71011a---73408849071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=holt+pre+algebra+textbook+answersPDF 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_off000232de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232DE 10744 bytes
SHA-256: 3a5d76223ebbcd8e68f7a28bbd044eedeb0a5633a5da07a192dbdab1e5297161
font_01_sfnt_off00024b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B90 19944 bytes
SHA-256: 0daf20a855c18e7ea05427c37563a7f020689a900d483173cc014247710c359f
font_02_sfnt_off00027f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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