Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e2bfe3e560a745…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 15:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10ea73feacb2d51ef7688c76fcb75deb SHA-1: 0997942992f03d08e0b5a5e92576a7fc5c232350 SHA-256: a1e2bfe3e560a7459ad8c3b8183b30e98dee7300420c1e4bdc80e783ea471ce3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://delphin-restaurant.com/ckfinder/upload/files/37265493691.pdf In PDF document text
    • https://porfic.com/fotos/file/46237796495.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/89291648802.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fj6iljs6501ucrvo2jl3p9gah3/leludebepiwefikuxod.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/67720508575.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/zaworigikodajinugomi.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/24043634165.pdfIn PDF document text
    • http://hanauhrova.cz/files/vulibafajenezoxoguloninal.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/67531122024.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/folorurajidaru.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/rekifixaxizobikene.pdfIn PDF document text
    • https://naves.cz/res/file/budelu.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/gukixolugakufidivole.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29596516240.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/fejuvenagavovenos.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2efac9796---86154013632.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38150792236.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/46588806645.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/76fmarrgv7msvssob38rfeqral/84589872736.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pemimivobosaf.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/70649402474.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/pedugekugusop.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xabojaga.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/98725044980.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hkf4kcv07c9cdnlqkkn8hblqd6/zuvomazatizijekaxakude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=reckless+racing+3+apkPDF 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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10640 bytes
SHA-256: 07d7ef38d9da249c1abfee50f7b5f8aa102cb2ba5efd71b7e0eeb3ddddb3637e
font_02_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 20504 bytes
SHA-256: 72c22c714b12bb7046b44521c499fdb6d206e4fcb82cf0aa9dc2641abae35e2b