Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6944440e588a9a4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cee9d9d8935466b4317199ab6a91272 SHA-1: 430580ee85d99b01dfdfdfe7346e571c9ba4d49f SHA-256: f6944440e588a9a41a7f08c9644da9e19cac3e877a723d5eeee27dfaddc29830
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, with multiple URLs pointing to external resources. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery. The presence of compromised CMS upload links and disposable hosting suggests an attempt to obscure the final destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://support-trevianum.nl/userfiles/files/dawotijifig.pdf In PDF document text
    • https://kaptenhoki.info/contents/files/65592072725.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc044c0d8a---72279293394.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630546386.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/41706831293.pdfIn PDF document text
    • http://gabortech.com/admin/file/kesizifirurajisujaju.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/koxewoso.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/lafuw.pdfIn PDF document text
    • https://tele-video.ru/upload/files/31382710021.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/44547047868.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416944e95ad---kebebemelom.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113d3eb629---39757194148.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/49155097400.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xirazijesaza.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/60458699144.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jakikukewurununoko.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/10527687856.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/sorajat.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/23183565743.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kanejaxexibuzulito.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/worojujuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=moral+story+books+pdf+free+downloadPDF 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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 10824 bytes
SHA-256: bb44409f2975caf2392577e2c10ce822dadf3eecab383bd40ebc2c0a3a116141
font_01_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 17512 bytes
SHA-256: 420d4c11563e1539d0672eef8a2f66dc190b4425f95a166e49676011f15b3d53