Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dd9fd64a38e01c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 16:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81e784ba252ecc965f9e0b4e1b70c509 SHA-1: 91d895745f60564db63121104faad98ccc39fc42 SHA-256: 30dd9fd64a38e01ccfeda0fc58351405e3e5f106823f793b7ed07dee9df8a679
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. These links likely serve as lures to redirect users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=x96+android+box+firmware+update PDF link annotation
    • http://p-itos.net/admin/userfile/image/file/dasojogupenekuk.pdfIn PDF document text
    • http://tulga.ru/editor/files/93766118911.pdfIn PDF document text
    • https://aaaxxion.info/images/file/86141578986.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361e3ec2a04---gatuzafimurutab.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/29106236081.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/popiruvofazijusinovoj.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/96504409639.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/77591266938.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/37023621972.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jisafinijejareduto.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/46894051981.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf88194c85---56907118973.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/tadeg.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/58987706222.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59882843386.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/8569480452.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910085402.pdfIn PDF document text
    • https://digicpictures.com/downloads/sagijanunixukuvido.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161377256f21f1---kafetopamuvixiruwu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/63408706593.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/59642102149.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/luwanejumiru.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/jekudawerufuwojugidoxima.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/74155636198.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 20860 bytes
SHA-256: 73bab880e1e6e35cb819b87561071b0a6a3468d4bf6ed9025708a18525d4b35a
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 11216 bytes
SHA-256: 8e12772c75021bf3528ad2fb4e38c04c082f8feb1c482392b7952a2d03d4b2b6
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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