Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68d88f99aef8a44…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 03:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34fd16c65f9c64661de376db62ce1b31 SHA-1: 8b5caff12d09d21c85a1dd4b1d0741070b9084cf SHA-256: a68d88f99aef8a4459237998b290b8d1f3a0fcac277c798888737c47afa1a2a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest the document's purpose is to trick the user into clicking a malicious link, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=family+album+app+android PDF link annotation
    • http://tongshengchem.com/ckfinder/userfiles/files/pikogavobuzipovipipunad.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614013e9ea3eb---fixiweranawajelazog.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/kawop.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/44965683984.pdfIn PDF document text
    • https://topupdana.com/contents/files/65906912122.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/raguwomofakavowatu.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/95778490538.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0ece9a5d6a4e5d22c2fb99170f3478c3/11544403277.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/1922430704.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/14815978008.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/10490642097.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/xunavesek.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jikakidozolovofolomuda.pdfIn PDF document text
    • http://standardamulet.com/files/files/57226469905.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/dibiborubedoduvuxa.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/fevorex.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614030ee29417---12684030317.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d605d32b1---58984659966.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/29314510745.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/521823090.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/memifom.pdfIn PDF document text
    • http://darstin.com/userfiles/files/pemaxovabuwobedolawume.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/8752802577.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/75706729615.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906125813231508.pdfIn PDF document text
    • 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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10484 bytes
SHA-256: 2d61d5c6039a4d69bb8f291e96b094353b12b24f1834f8f6bd30b38acb77c042
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 17624 bytes
SHA-256: a789dc7fb9db27baf9758f194c5ed90d067e75b6d400e5a268b83e9f138f16f8
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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