Malicious PDF — malware analysis report

Static analysis result for SHA-256 de11912177be3e12…

MALICIOUS

PDF

171.2 KB Created: 2021-09-12 07:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 001cfd5e37b4f0074ca1dbe3aeae94b1 SHA-1: 24a30c7d5603e62ae000e3d750ca90e45ababab7 SHA-256: de11912177be3e12195367c989d94e75f2e2060215e709f81e997f836f9bdf2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=wonder+woman+1984+xmovies8 PDF link annotation
    • http://abcbyspu.net/ckfinder/images_store/files/57170093293.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/pujunovimumemigeluvapakut.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tiponurorelujebuta.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/wurav.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1b5e95fc08fdf0dd229e218886761c96/24295966723.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/92457322343.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f074fafe7ee69765b572d55b83ffe70a/73902381855.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9cbd52b5---nivokekolusi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///newudonitizax.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/dojijumitovemamefadurowe.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/83155556912.pdfIn PDF document text
    • http://wdnederland.nl/file/77208508687.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/dazidikaxalomidado.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/lisakosabe.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/burumus.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ocvib6q3kca2n73llchb3o5ieq/10323195842.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/60781114337.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jejurumuzezoxeba.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/wigirata.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/4434611304.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/56327003049.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/47198460200.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/diwuxuzom.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912040101.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_off0002356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2356C 11016 bytes
SHA-256: 657d9a081966388eb3007274bef8eadebdbefac7cb4ca602d47b87a85e2c0c33
font_01_sfnt_off00024f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F31 21504 bytes
SHA-256: 519c50074f7d906e2c7fb831d8b177490bc619f5d26a3123eca3f85284322e95
font_02_sfnt_off00028738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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