Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06f92fea85c0156…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 15:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88d00c8583f6fcaf114d39e76483fd7c SHA-1: 0f1ffb709d689fa505830dafaf0f3f1ebddc833f SHA-256: f06f92fea85c0156d438fc0fbc1508638e1f5637bf265f2d00e0cf9f02b4c31c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.mbk-montage.nl/ckfinder/userfiles/files/daguv.pdf In PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/sexerusukegonurikutiv.pdfIn PDF document text
    • http://bamor.org/userfiles/file/85287735317.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kudofipok.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/jukebasemunidolikinimob.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/mupizolajafuwufax.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/38b17f567beccf1e6857de457f2481d2/14932743491.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nupovefonaw.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddf0ba45b---10614731960.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/xonivamorofirumexepaxeki.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/mozowukami.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/44839504356.pdfIn PDF document text
    • http://landpas.pl/upload/file/tekaribozedovetifip.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/73248611183.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93918620896.pdfIn PDF document text
    • http://aa-nusd.jp/50264335586.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/16202969213.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/mewasoviwidilidetufewuvuj.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/gulinizutig.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/44306044883.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/romiguxifubinabi.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/14438103489.pdfIn PDF document text
    • http://www.bash.cl/media/file/18353537844.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140389bd5229---47103071455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+access+photos+on+android+from+pcPDF 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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10916 bytes
SHA-256: 3499b707310c559d175a1496d7393b752ed6de4ef2bc755923866e09e0c65ee2
font_02_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 17848 bytes
SHA-256: 849d4e9c2d5dcaae50db4fa580c48e7f910ec5385bce14fc9e792a54ffcebfa2

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