Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc625ca5ac7dfcbb…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 00:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc589395490e7f73ff765b0678ca8368 SHA-1: 9f0931023675423ecb8c82831f6b069094959342 SHA-256: dc625ca5ac7dfcbbb4377cce9a6375d6cded251e16a6f008a6d4e6d6db392694
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on compromised or disposable domains, suggesting it's designed to redirect users to malicious content or downloads. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kibbkw.com/uploads/file/kisur.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083785b17120---55157003505.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0707027899---27050590956.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/45df0881a190ba313f29a922ff5f2d59/72305882041.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0ab7ae641415b53925dbe94d48e31cd/24456899657.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bab9c0ba8---50516375099.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9986677d240410c0eb13cc253de0bf4c/jowerowalimimoxi.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9eb6uih8je5f88ggbrs1kd2801/zenikafefoduxeriwirar.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bokotozozuzi.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jl3fuivtsddl7kd7ts28dr87i6/81972463564.pdf
    • https://securitydm.com/slicice/file/sopawuvimatiz.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5f65e581---37714102419.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a44ec0801ce87add815f39b9db4460b6/46368674863.pdf
    • http://poolprotektor.com/userfiles/file/xidutajigorabuxakazajaxe.pdf
    • http://sam-global.info/files/file/84549800337.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c297f6132c3---mivupozogiwowanokawanele.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/172f13ac18cbac804c9387e60a0cef60/858619840.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1d4515bc---24752166466.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a87396aa556---luvatoredugexumunamikelun.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608902c0dd077---wuwutoxojusiwatus.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609634ba3bb79---samiwurilip.pdf
    • http://seabeachthailand.com/UserFiles/file/48765946620.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160920f2e0d812---fuwebojebosupivi.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ae58a521---guperonolar.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fa7ad06f---31275482231.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fda1e838d984def69752c6d8a138efd/kikewikenexunujoxoteleres.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f49dbc60b89a0b3dd53082e3edb9bd61/mebomedodipagozawumopexu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clinical+obstetrics+and+gynaecology+4th+edition+pdf+free+download
    • 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_off0000fbbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
font_01_sfnt_off000113d1.bin
26fb7878cdfd5a86b71669cfcec84a996c4c2c58484c137f3db088a50ce2db59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 17412 bytes
font_02_sfnt_off00014194.bin
c175749e41e1d864109ba3f4fec1f82843f8e699405e09152f9fc7c4ceb882d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14194 11348 bytes

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