Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1175ac8ab8e62ac…

MALICIOUS

PDF

108.3 KB Created: 2021-09-02 20:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21da4fd4872cfd8df7f12410e39ce95b SHA-1: 144832b30850d83ccf6eb0b5bb8b9d75d169087b SHA-256: c1175ac8ab8e62ac5185b50c0e32ebb2f9449db10ee2fcfdafb9f8d78306fe67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to various domains, including one identified as a compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://agiusfuneraldirectors.com/files/file/nomidugopuvavofiwe.pdf In PDF document text
    • http://orhs89reunion.com/clients/77823/File/juxidinigurivedogutewokad.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/29651404825.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/doruka.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/pidog.pdfIn PDF document text
    • http://keacg.com/upload/files/bibase.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090eac60695f---74218997629.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe53591a7f---pogujar.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/60732346906.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/59118819324.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/faguviriloxenofefaxe.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/xoponetusexoxedajopefowox.pdfIn PDF document text
    • https://ghnservizi.com/file/giroguwike.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cd43621---80466547676.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/92147678277.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/65208089543.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/wegotujokulekolibiv.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/99779396322.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/lovunejevaxumelaribidojev.pdfIn PDF document text
    • https://bloc-immo.com/images/8006500924.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/735d9cf5f0469a4a97f32ec0ba0ba6b7/51537743607.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kavasarajarilinu.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/35565525968.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ad5677a5---10016960744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rwanda+population+and+housing+census+2012+pdfPDF 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_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 11324 bytes
SHA-256: f1559d9bed2c3a00827a372de09aefd2c40883546ba3533425055099724c9c99
font_01_sfnt_off00015627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E39 19988 bytes
SHA-256: 7996bd7da22a9777e00cfa3f7598ef74d53d7c4df9ee8f27f5ea9512dd3fa1d3

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