Malicious PDF — malware analysis report

Static analysis result for SHA-256 9872bb9fe4df18da…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 18:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa74ae69471ed740ae95bb06e9720a0a SHA-1: 742b4c665bb13c68badb9de05608ef5fe5a5d1b3 SHA-256: 9872bb9fe4df18da71b67a3ae29ece2f926c887a4cb191fbdab8da217ecdf58b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis are sufficient to infer a malicious link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://artpolinakuzina.ru/pict/file/66262435125.pdf In PDF document text
    • https://lacaune.hu/userfiles/file/70510657010.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/65790285116.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/sazosunukevifun.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/sasutidivala.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/90656521083.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/65414153463.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/97958827272.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/40922518479.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210904005957.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135818b97191---lafegonuj.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/98992399896.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/buzekat.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/83625423850.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aab8j90rln4drs09ug1mks24a1/bidibobonevimisatirojasa.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///fegivuniwubikapedimuj.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lororenabobekade.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/23062561473.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aac7c259cb55285bf6095639b6b0fd6b/4393078067.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dikilisakifuxizalidawip.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/jubafewezobaro.pdfIn PDF document text
    • http://millecolori.it/images/file/86934962675.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=articles+on+dalit+literature+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_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 10692 bytes
SHA-256: bd1ba4e1f3ce5b79c0ce5b228a976ea769b22d3242b5231d919ea8560517c890
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 18600 bytes
SHA-256: b099a0c061aabdb78042f95a117d8a50f6f5e1975a6e663ba9ef87504350fed9
font_02_sfnt_off00012e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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