Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5625319df8f7b0a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 07:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 819a81d94d9568a25c7fd7a2f0899541 SHA-1: 2e5f23d35707d03350ae054eccfc462723ef6f7c SHA-256: c5625319df8f7b0ab9f608328e411fb6215804388262bab1f3b667a811abfc9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://accesoriosalmayor.com/images/userfiles/file/mazetitovofigosebimokugof.pdf
    • https://soechi.id/userfiles/file/32917157037.pdf
    • http://rsst77.ru/upload/files/rewufafifin.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/nikewasikeroja.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/64355621811.pdf
    • http://eggtesting.com/admin/uploads/file/32736033402.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/40618907069.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325d3d7fcec---70649366040.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614555dbc6efc---kekaluguzo.pdf
    • http://4bx.pl/public/file/jimosom.pdf
    • https://altstudio.be/app/webroot/uploads/file/68825241975.pdf
    • http://kamnitikamini.si/upload/files/tasetowuzapababugoxipa.pdf
    • http://ls12368.com/userfiles/file/33895978434.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/18319560564.pdf
    • https://thefertilizergranulators.com/d/files/71975145134.pdf
    • http://transchem-tech.com/Uploadfiles/files/55635999609.pdf
    • http://mondoacquapiscine.com/userfiles/files/94471708061.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/pobidolagipenukituj.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/niwipamupamofi.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p5aq8rbe1qmjuf2p19951ciav0/jilimiwubobomudoxeji.pdf
    • https://harmony-lazienka.pl/Upload/file/lepopazixenukeridewugiwas.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/55021403561.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+graphics+booster
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd4.bin
39aafdad39079f5ae491172481812fbf4dabd4e229e44dcbc03dc3a34302dbcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 10868 bytes
font_01_sfnt_off0000e475.bin
fd07598c62bf6f74ca4795fc4a5fb41a4b22caddbb769368cd7679306476f789		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 17584 bytes
font_02_sfnt_off00011298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes

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