Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bdf32dcb665e91…

MALICIOUS

PDF

76.1 KB Created: 2021-08-27 23:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de1ed100c2173cb6f58fa7559e56b051 SHA-1: 46bd0544f1836b4e14e64163327a4d82cfdab361 SHA-256: 55bdf32dcb665e9177a957c0a08864e25126986063a60257decacf97682bedf2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious PDF files. This suggests the document is intended to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c06385509---3699924367.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15d49e3d---39554636506.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/57857068826.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/21794542268.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vopagiraka.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833060ded27---47732209473.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1628702988.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210718135106_o066hh.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/1538891011.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3f4qkjc5bqr8rlk8u8vlamd8sp/movibabosibaxad.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b04a130ecd79e18aff175f70d226f1e8/38962252490.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/pinag.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9ccec640b---siwapolonobororupatafep.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/32037239614.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vexolomebiruzigipi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/376ed29c679f6bc0ca5121eef882df0d/76515192034.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/masejebuzurulopu.pdfIn PDF document text
    • http://krzeptowski.pl/file/jasifoluniwurabubezoxituf.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dc1439e9---vakoludavopogotagu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cea005a9---11557603511.pdfIn PDF document text
    • http://katachizu.com/img/news/files/24284811358.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fc58a32d27aa0bb86e558067a0f1c445/benurexofavotemazaxodu.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bogujega.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1553879bd7---12997311981.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rikumemitalizegopeludot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ai+ppt+templatePDF 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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 17128 bytes
SHA-256: 0a118ebf0afdc4da6f94997cc2e5bc09d7607a29866c2f0a5d8fb2f331c1ee2e
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 9904 bytes
SHA-256: 8acdb2e94fe6988c9dd0e18572fbd4b97ecbb32e7c0c6ca21f51e8e0d7e085f8

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