Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e2d09b5efc6b55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12306a3b621efbb1ac41dfe1f046b300 SHA-1: a4d3e96b2f741969fce04aef02c632b46da1ba9c SHA-256: 78e2d09b5efc6b55f2f70afceb146e4dcc14386597f3e484c56f4475e161323f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The presence of numerous PDF files as links suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://isleo.com/i_photos/file/12862607226.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gukonizukivuraxuluwer.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/sezosavumamox.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/33835534435.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/silinawegabanuxu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e2b12d8a---45741096315.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/sukox.pdfIn PDF document text
    • https://adikkedua.com/contents//files/78222183509.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/53460238974.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/bawamo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/femaruzop.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/57116925966.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090522c134c6---piwirazudaxadis.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ddee83c50ac92a552e3dfdbcd646e040/24227011382.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/50340407469.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf886a96ab---peloj.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/kowoku.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/jufebifupizitoruwot.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308e4ce469---samilegatovevibegul.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/91301628746.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7a85ce66f3e131d6ff7cd01381f27c8a/jafovulopi.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/92976412864.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/14252184594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+kg+to+pounds+formulaPDF 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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 11204 bytes
SHA-256: 0d72b261a12702a1253244b2bf0a5ce334adcb19f3104903b29327298c69bfdc
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 17724 bytes
SHA-256: fbd20d16b7f623c4b213e9d0301aaae06ac94ed8a1801cfb71825d3b4a8dcd42

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