Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485b400455e4318…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 23:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84e658e4d29e1a23895abf264de22092 SHA-1: ff4859293641548261e550cf14b83f799785b6ee SHA-256: 1485b400455e4318658a88af0f8d6c3e792d6166eba73f22312ce4dfa354fcce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or directing users to sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to exploit user interaction by redirecting them to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=transfer+music+from+ipod+to+android+phone+free PDF link annotation
    • http://defhjdr.friend-match.com/upload/files/sibavogerigafunijirefazu.pdfIn PDF document text
    • http://www.bash.cl/media/file/76857066330.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wugamijimasabutigoxupixuz.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/kutimulofilugijaduparu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/lagupamewogaserububepivuw.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/39953192727.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/57916168369.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/31164286898.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d50cd7286903e0625a303a0b6319d7d/86121175938.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614984413000b---toserulitowixiru.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/witaseza.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/12157240143.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/65659930040.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/7879230985.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/lujov.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/xewusetoxotagegemuvadi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293b22436b---73336187568.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/lekebem.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/likejutomazimewukuvin.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/tisukezodaseguja.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/71281485831.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/povufebovapi.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/65620759314.pdfIn PDF document text
    • https://aayams.com/userfiles/file/92885487568.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pepefe.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb04c34ddcc1905c42471ec2bf35aac/ruwokavobukasolon.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/tadederugojisa.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 17152 bytes
SHA-256: f1f2811a50bcd54a4f7f545ed28e6bea9695ced53f0f620bec69c5dce3528554
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10904 bytes
SHA-256: 0883298f2e3f15caa87d756c4b9d1906e5525d2fe036cddfecf5b0c35164b562
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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