Malicious PDF — malware analysis report

Static analysis result for SHA-256 638ae88555070a54…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 07:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 862e6bd9f1ab746e165415c77c2c09a0 SHA-1: c1b946ec874bf8f7da2e7d4effd4529ffa3a20de SHA-256: 638ae88555070a54248c5b2ceccae327e6a67016a6f280eb4d44d58407e4f76b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and does not provide clear textual content, but the presence of numerous external links hosted on potentially compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7e026036b879eed408112e5e1544b309/33124987778.pdf In PDF document text
    • http://xyr59.com/filespath/files/20210827140617.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/87309387043.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a581c87a99e---69712002322.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c902551d---jatefokezo.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/pogadorififegatunenumik.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac01cef960321a537fa5937e52c4425b/rusileb.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4b0493aadb20091045e8b0590e24c39a/bupapuvelanuvaz.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/jazemavegagudukomuvutiga.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/zukapumom.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a15c2054---87410993635.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/15664236617.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/18587967859.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/92247671967.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/lokidelotudobaxerebemej.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/86213a483d2b91fca6f2defe5573cac4/45171202499.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/70530754197.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/fetisekafexusopefute.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2d6b3qkmhmlp0uavpretdhkmod/20185260041.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/tofilas.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/67232485871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=oxygen+therapy+for+tracheostomy+patientsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 17484 bytes
SHA-256: 56c1155e7f862ba22f413d2f4d3a59c1b9f8e8c5f492b761f6d3d0e870d1a0d9
font_01_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 11120 bytes
SHA-256: d3204c740653fd10300c7564475a01028cd2b5d9849caa3ac66b44c30a821554
font_02_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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