Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d38e2f48f192776…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 11:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65b3a2faffc497aad64a51d733b1c35a SHA-1: 10311bbd43be87a8bf7813f059acd47ca22a3319 SHA-256: 4d38e2f48f192776cd9a2bff8511918bd7c147db7b0d0c810b83c363e427a1ec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eagle-aviation.com/userfiles/files/12768795993.pdf In PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/43979319936.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gawoded.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b4c9fgb2or5a094asb3niv1m5t/bewesakisig.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608001fb212b6---nalukifane.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100d845006cc---7194077733.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5828a8f4c6---sepokisiwezogowilodamele.pdfIn PDF document text
    • http://slsnn.ru/content/files/61844581607.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/20990672702d65bd8cdb7a6806b0edd8/fosaxowomobiminutu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kuloxegikunafujulok.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/84nnsj5c3u02lh20t83r2tpui2/kurotilavijotaxi.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/kodifijasetataf.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/kutedajaxut.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mulasegixim.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5b753d36da585af24a2987352cf12995/dumeno.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/59770661907.pdfIn PDF document text
    • http://effekt-film.de/files/file/nozomiwelimagagizodubafe.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/pezodibezirizeweri.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/basukuvatolikofalixojenum.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8j8mtsugje4gio0teci1p6sff4/wigojawadoferijonad.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2db2914b---kagumoxajapizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=prepositions+of+location+esl+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 10616 bytes
SHA-256: 8599d20febe02c76c9b66b245a83edcfa20d3cb07f742c28dada97d148436a42
font_02_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 17584 bytes
SHA-256: 051d2c8538ef27588986d5a8e71d4cb28aa02946b369ecdf1b52412c6711498c

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