Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a18669d31e06bf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 04:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d116a9aebab043a5bb3fb226f04ccca0 SHA-1: 614da1cedd26cc6f5045cd11b139af4f7b59e2e3 SHA-256: d2a18669d31e06bfe36272968bb131c4f7ebb9b4fe4058bd8d7ba1d213487890
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f8341948---dapaderu.pdf In PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/89297682817.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/68523184437.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/19637192411.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d9fd5b78---23731566015.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/dizibu.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/zoxexizejupozulisu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/94037959208.pdfIn PDF document text
    • https://wrd13.com/force/file/79967278374.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/44619771046.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/demotomizop.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/29141159950.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/smd0nj31e2g2o2275mejm53ona/zejomuxuzukibolebemave.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jitagepene.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/294275206.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/voduzojeb.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/70488798133.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/75900828826.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/wozopi.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/21863004615.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/98179744268.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/72981607746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=two+heroes+full+movie+freePDF 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_off0000b762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 10328 bytes
SHA-256: 4573a21abf291a92733cf529bfda5811bd166c94a16033abed3e02070bed84fc
font_01_sfnt_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 16492 bytes
SHA-256: 0376b5ceb1137adc33e3c55742b79a435e7aa8e65945b14aefa2f03d63b76b13
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1