Malicious PDF — malware analysis report

Static analysis result for SHA-256 b406a510bbf3d118…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 13:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f369598aa28438e0b8c52343757ab7c SHA-1: 68f0db3c8ac08d1123ba691cc04f3fc820640914 SHA-256: b406a510bbf3d11888aa439b1b5a486452440186abb7faecbe55dfb46d66bbfb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g2gcurfkjasec6ith3esddpn61/23477843923.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a63225fbb9ff5378ac27b785d3609665/vidomujiwiwazaw.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/6550134670.pdfIn PDF document text
    • http://jucal.es/images/file/78915698727.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/85444196992.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/36639c14e1064f5aee2da8eb0742cd4a/94173640900.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/welesugaverujirazelizud.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/76144294207.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bururorasamaba.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/lalexudadizipali.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/97510262749.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/38712264328.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec0af97527---rakumojepaxopenap.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e2c99b7e---xufuk.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/92102771568.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/binixekomiditagedumo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ojs9ad26na5cnl2b9inbfinsf1/48121098570.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/ruxipabetamasunoxazowebud.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607414aef40d5---xikijimalud.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12977841851.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1eppau4jagut1cclq6od9f377d/40153703160.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tujuxamusodudevun.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124e9d885724---12666854602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=experimental+research+meaning+pdfPDF 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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 11032 bytes
SHA-256: 1970c19fe4e3284afa4156417ee256e92440c38da9495dc441320765f9ec429d
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 17636 bytes
SHA-256: c48a11d56771838c043e85f95a612d7515ac8396e71d7a5b07e5d199f14e8c14

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