Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c6890fc388858a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 10:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ba975d51aad073e0a98eeb73448edf6 SHA-1: 9d9d76451e21486869eeca19ef63354feb8ea608 SHA-256: 79c6890fc388858a7998a1d71e4387e3a900064222b75d657544e0c2a9f55a30
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bawaniint.com/ckfinder/userfiles/files/tegoguvipenowefobuz.pdf
    • http://dichvuhangngay.vn/uploads/image/files/35560006540.pdf
    • http://voyagevietnamlaos.com/hinhanh/file/41403180193.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/96099296434.pdf
    • http://slsnn.ru/content/files/winute.pdf
    • http://hiddengemsbookstore.com/userfiles/file/89189415790.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140147281deb---16506183778.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff616e7d9---52053785603.pdf
    • http://fioredda.com/userfiles/files/10603871128.pdf
    • http://glassick.com/userfiles/file/41969960205.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/95457923707.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f45764c4---wefezu.pdf
    • https://deltaguvenlik.net/userfiles/file/dulilemusigijabagodu.pdf
    • https://clickbox.ro/images/file/nenonuzapavidepigonadiko.pdf
    • http://gamax-moto.cz/data/dokumenty/11920749003.pdf
    • http://www.ondebiz.com/userfiles/file/didekiwofu.pdf
    • http://worldcar.jp/userfiles/files/vofipexujevopewuxuxovegor.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee7733e27f---56211948829.pdf
    • https://dodatnojamstvo.com/userfiles/file/37975773086.pdf
    • http://twfbs.com/ckfinder/userfiles/files/gomem.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161420f4379972---18258892021.pdf
    • http://minerva-collection.net/files/files/82121428208.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147ddf974a98---54332983266.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jungle+cruise+2021+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b14b.bin
add5987574b9e82421c26858ff5ba7245fc50bbf4dadfb0f73de98141feea1a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 10868 bytes
font_01_sfnt_off0000ca79.bin
845d4383a908087c8cc55a0f415ad6571b154b78bfb0aed62f11cb81e51bff34
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 17140 bytes
font_02_sfnt_off0000f699.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 16792 bytes