Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9cc2677c469982…

MALICIOUS

PDF

92.4 KB Created: 2021-08-31 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed4c29463f92c3257dce3cbf9405fbb0 SHA-1: e1e3c332d9842b321373745dc73b5b9ff2a4c997 SHA-256: 4e9cc2677c469982f7a8781f80eb09c4fae7b3ca38b67918847b8942bd43eb71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to manipulate search results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ottotech.center/userfiles/file/petojoxenezuguviluw.pdf In PDF document text
    • http://transfertrolley.cn/d/files/472755248.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/jusulefixuwawe.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/04c7281bcf2e7012316c2ea318ab84f1/bigojaxesalasijakitela.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17854437975.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/dalowetakanuva.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf228e51---86242891708.pdfIn PDF document text
    • http://dgjst.com/upfile/file/82568801396.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xemesog.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502942a8f8---7347776736.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab001b58c28---liwuli.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5e10e2b1---72073501358.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nq316kkhbtfmqu9h72prnt0m6u/78271851709.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/viguton.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/pifewokixa.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/46768210817.pdfIn PDF document text
    • https://ecoretras.com/file/85303602302.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dcb7471bc---18935228112.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/56606709126.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/47790923558.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40f1ba8da286f7e5a82326e5e4834e34/88944044883.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/pujoxonolozularopejubivo.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/wewovejamodogesumukugi.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/98438852011.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07c51d7d4---10690704729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=real+estate+project+brochure+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_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10936 bytes
SHA-256: 18ae384ee83f4c6ac9313178e3767a8895a8df50531bf6fb53bdfd018e57fee7
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 17124 bytes
SHA-256: 864ee79a22e3d4351c789ab43da0d81397653d370cf99e89150e8ea65195bfbc
font_02_sfnt_off00014aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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