Malicious PDF — malware analysis report

Static analysis result for SHA-256 6734391efb868ff2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 08:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee3da4735f69dc954a12f74300ad29c7 SHA-1: e8d0e11279853ba472635cfb12727c7328236365 SHA-256: 6734391efb868ff26ba5e9ae3b0d41ff9c6d40671028f5b32624bd82899d89e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ebooksweb.net/files/file/20356935033.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a43575b4f609f5b7f711d1a2adb09825/8433151840.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c54b3aa1---sesetimanatalodilijus.pdf
    • http://fresh-j.info/images/uploadedimages/file/25479182141.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035615f67e---32219980291.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/56115244972.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060621422573499.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d584e7f25---rufuxagosukana.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/49kcs0blhora7vloqcr6n86oq6/lakofepoxupeda.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/751f5d0c394b8641ad6a13bcdf89b5a0/rewara.pdf
    • https://advantagelic.com/singhania/downloads/file/visegopal.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f6b173af---zefurupelurij.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fcdedfc5bfaa6ee038a77086a898c26b/19409791364.pdf
    • https://akapacha.com/userfiles/file/vefizopaganinimev.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/vuvek.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49dff9d6b4---38483200318.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48c2793edb---vovowepopafi.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/16fe9fa1de9622ec9ff143e70b05cb73/povaz.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71b95aa19---pizuvaxudoxewosi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f111af13---59860761671.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/60efe5707161e6b7e5c17ecc1396bf9d/25493775318.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48b3f9ae3f74f8137e039d1c2bfa0fd6/wexupegedototukexu.pdf
    • https://bdsvieclam.com/upload/files/64725007288.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kante+world+cup
    • 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_off0000f3c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
font_01_sfnt_off00010bd7.bin
d017e068d1bfb17f2ed0bfd0fa1659f76968e63f73723b4559fce46705f5ce72
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 10424 bytes
font_02_sfnt_off000123a2.bin
c469f1086096a8e7b4b072f8104cee6462d1b83d3d44a650670248457c4b08c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 17872 bytes