Malicious PDF — malware analysis report

Static analysis result for SHA-256 089a405b2508910d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-27 23:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6def9c44faf3d2bf4964994cc13c3a47 SHA-1: 7c1d922691937b2fb1d6b5b56765cf754d507acd SHA-256: 089a405b2508910d6086b2e2af28ddc6bbe9f130c3d7c31995b5b7edc7efd761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=writing+a+good+objective+for+a+resume PDF link annotation
    • http://emotionpicturesfestival.gr/userfiles/file/wirilawenezikare.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/83117395466.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082b600a9175---95673116975.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/39902414462087b3990c78e73e32bf2a/12088235354.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/jorotodolob.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf80aa14c0---jawenepujog.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/66975612969.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1140fdca1a---25503232501.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jouesvmk91c661lt5ipv8ol7c2/35435409181.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ccaca98---99029111483.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4671aa1---42583337671.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/edfb54c185ac92f65bd4e90479c30249/wafizoxebugeradarer.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/57697631306.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/lozitidurinomivawabugapu.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/6716066411.pdfIn PDF document text
    • http://limoride.net/gallery/file/16836107587.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0f5be10a954bdc94bb45b3ce45ab1e48/tijesoxalosuvafefofa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/29427435947.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/47745978907.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/tilosalexaweri.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9bdd18bb---56882129838.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feaa5d2e8d---wivurigezujiminasexonipi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cu791vm8i15j7th0j1nnqho8q2/pofovixaradijadatol.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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 11204 bytes
SHA-256: 75abd42bac201bfe2bddf3fa2d015279ff11ac746a53f8640397a21e3c0ab7a7
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 17504 bytes
SHA-256: 5565d119774143c56441082c9f5c38055ba722a3a5204dbf8fde8fcac8825a3b
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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