Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b1c788cb6b7792…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 07:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1984ff6a87877624234416bc924d2c1 SHA-1: 9a3b2ad8b9dbca2be6ccd5bfe46001d3d78bf7a1 SHA-256: 64b1c788cb6b7792635e4fcd925964d3121dbfde8552ab3e61c38c3b61406f57
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of multiple external URIs and a link farm heuristic strongly points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=biliblanket+meter+ii+manual PDF link annotation
    • https://senfina.top/uploads/files/66402975537.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d51c9428---sutogaxupaso.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/maxirudisasaniraboxe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3cd734ebe---nuvatajemasibapexiz.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee597eb15---lizebofewarasizubuvib.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/sojututazezidajejarez.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4af7b9ad---72529670071.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a2a1293---kedeti.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31cf27d4d9---lutofunevupikebekigi.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/50072262711.pdfIn PDF document text
    • http://dnepropress.net/files/file/48985814530.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/94577639892.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bh5pu3h4e1cvvr71o7gddnkc9h/desoxobaxemanag.pdfIn PDF document text
    • http://wwstationery.com/files/file/17884846681.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lbtdsfbotp25abt7fg814f6j3j/todipawovaletogalasepij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f166e5f118e---fuvoxejuvozo.pdfIn PDF document text
    • http://ave-france.com/pics/files/pavarumurawunij.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/11896636178.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/lunezolajupuzividebesizax.pdfIn PDF document text
    • https://razredna-nastava.net/files/gedijexivu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f76ccf3e1---lanedewizitawowagupu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825c79dfe8---92242256064.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/15631201004.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jasir.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/15603150798.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161175f468eec7---lasagakejobetuniri.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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17920 bytes
SHA-256: b6c2de0eb05ab0cfd0796040aefac7d280a7d680bf922643effdddf78264d9a0
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10368 bytes
SHA-256: a2b88b3fc1d9b11f20dd1340575f55f3d1f8faad126e719d0c51cf4da3e6f2da
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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