Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c173f2f1ca8d27…

MALICIOUS

PDF

106.1 KB Created: 2021-07-25 21:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6307505280683bc6ab870420a2f40b49 SHA-1: 785eac3aef28925c8b916e442057af3f6746e680 SHA-256: e2c173f2f1ca8d27f18e01460d01ce612de10d9188a6878629db0496fe506975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nhahangphongcanh.com/uploads/files/51553245130.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb75539bed---32900056620.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hufh8v3kgrctmi2dvhlqq18ue7/13181614376.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9539852b53a0edbd8db2c121b1b1e230/welipotegeselax.pdfIn PDF document text
    • http://lucann.com/Upload/file/23679993141.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/nelezife.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/99770861580.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/rujirotobefonoret.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/94618867231.pdfIn PDF document text
    • http://mesterek.net/tmp/toluro.pdfIn PDF document text
    • https://actorconseil.com/files/file/72239804498.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1243eeb39cb1323f40fa7f9fbc44fdd8/xirebifaburibafaxetefebim.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/goduvadinonatapokob.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9206098919.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5280b7e9a---16465356092.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5gu4tb92ghufc5bt87dgd28ik6/81291927905.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5881ce888---87409187312.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/79371747077.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xelinogunubadukexuzif.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/99328603232.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d17e28290---1471683914.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/51929523698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clima+laboral+librosPDF 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_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 10104 bytes
SHA-256: 34f46a8749d48038b6f0f3bd600f813e912032ecbcf5606b8a490fc0d3ab6fbc
font_01_sfnt_off00015013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15013 19052 bytes
SHA-256: 952295c9c6618e04987f4b925d3d482f4162e675a70cd9fe418fd453a2fc24a7
font_02_sfnt_off0001805f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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