Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b60ddc18b70611…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2c784632865fed5ce92916b8d453821 SHA-1: 654dacdb6e42f5211c5df29202574684bb90e80c SHA-256: 08b60ddc18b7061100b9a11ea3dd7a451ee3e157724fd401611b3bc631067ae4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points to a tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210912135725.pdf In PDF document text
    • https://kakakmanis.com/contents/files/roxodeka.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/92746469068.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/saxazasiwaj.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12886486074.pdfIn PDF document text
    • https://wineart.online/userfiles/file/sudixewotadusute.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/43089225258.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/41996365972.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/virudezenukixakexumupelal.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/matanepirede.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/30544481316.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3e3981826824eba24a71bd70d96038a/96245828501.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210924_0BF997EE1AD6223F.pdfIn PDF document text
    • http://jfe.hk/userfiles/35776543069.pdfIn PDF document text
    • https://aildf.in/userfiles/file/5939590464.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a891996d4f---51625073248.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/pojuvemakepegerede.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161382a144cb8f---20890942320.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/newupulawexetadena.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/fujikiniwejufobiseki.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/bepufowadopakavo.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/16201255700.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/28264162062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+simulator+games+mobilePDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 10640 bytes
SHA-256: bd0410fbaf3924787c53df5fc922454f4b322c026bc50c367419450960270d1e
font_01_sfnt_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 14792 bytes
SHA-256: dfb05771329eb879be7029e5f5f1eb97be6d1d67b04e0c54871709d44b6ad72f