Malicious PDF — malware analysis report

Static analysis result for SHA-256 010771b47e1aac6b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce93f771dffaa0773aca71196d6fd945 SHA-1: ac9712b8b565bd61e22c1307f6d601dbe1caf47d SHA-256: 010771b47e1aac6b40d21d515c1ffffc3f5ad387d5d13c7de60b16990215ea96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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 http://wahluenfty.com/userfiles/kupinakuwetapagebe.pdf In PDF document text
    • http://vino-charlie.cz/userfiles/file/kekoxa.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/37132453480.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ce510f5a---jawukitomamifesilifef.pdfIn PDF document text
    • https://777mto.org/contents/files/kakikosevomamefurijusiw.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/3034019035.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0fd15c1---97399844667.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/jazumoralebizofazipote.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/51114676.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/86146264383.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/720a11621a170ada41c0ccb90c094d9c/nokagukasuxowebemad.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790bfb3df61---41922426455.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/xifavunuxafiwoli.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/92228303586.pdfIn PDF document text
    • https://maturana.cl/upload/file/87090960014.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4040daaf470eb0792560ff344de40921/59597185695.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o6ou2m659a6g97jc636a34rqds/ximofonew.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81882237098.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4397b38a80293fa77a0b7304b9e213d5/rifap.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/87026974633.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/fewakirosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ubiquiti+nanostation+m2+manualPDF 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10548 bytes
SHA-256: bd5b770e0a273da75918c93bfa9e114cc59a8c7e280232a9df4f7a0254f6f41d
font_02_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 17476 bytes
SHA-256: 6b9c444fb4784099d412bdbc9c44f4286edc2865568c9cada60ff52b25ff3cbd

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