Malicious PDF — malware analysis report

Static analysis result for SHA-256 c415565a482133e3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 08:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f60aa752b6c6fb4eef914c41b89f094b SHA-1: 3ccfd1099bf2b3664ac64d6c949b1d9da759af25 SHA-256: c415565a482133e38251e05fd494c9c8426a3f342ce81e50a75fda8a4e34a732
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely intended to host further malicious content. The presence of multiple links to compromised WordPress sites suggests an attempt to leverage legitimate but compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/cd47553822c0b71124aff465ba88b45c/gigilawum.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d21894e88c11f62dc15e1946410e3902/79758483312.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lawosumab.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/67024554871.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/57080936174.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/nakimerejokowidizalagu.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/14294776952.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/nopugoxuribed.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0a17006f191b1dd645b281178751d31e/lasuxukanobebajogodani.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910eadd368---68646222095.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/nozaxakinosesanizipulok.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/28672519323.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/40192336108.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbbeb9fb5---75424530840.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/50745437502.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161485bc0e9c27---79610072201.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917210332193108.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/vutidojizuguwokise.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/lapotonux.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/46141941949.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/51656599122.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/voxisifalasipudiwazubu.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wugugogidujatad.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/65227474029.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161496550747e4---bepomumirup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zindagi+kitni+haseen+hai+torrentPDF 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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 17692 bytes
SHA-256: de954a7ca1f47da49a0354f2c1c4d7f5efecff4aa5160e287a86d461c3c354a2
font_02_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10536 bytes
SHA-256: ec31f59a9f0fabb36f5001d48bab1ead7e469cec788cdeab2ee3000811aa7623