Malicious PDF — malware analysis report

Static analysis result for SHA-256 786eb1cd8fa3bf29…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 06:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adce5f6bc8ff2ceb7b098c79d8a82d82 SHA-1: f540fcd89506cff494feebb5e2a519d0ba476611 SHA-256: 786eb1cd8fa3bf2926920e0168f523baf3ad476c2a1b4722bb50be96cb33eba7
164 Risk Score

Malware Insights

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

The PDF contains a high number of external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. Several URLs point to domains that appear to be compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://hattshopping.com/admin/assets/images/ckfiles/70989774579.pdf In PDF document text
    • http://cauthangdep24h.com/upload/files/81918234340.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/sesafukiwibozaxosaj.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/vajefo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/povumuwunomelexujurizofo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f32eefc2---kubutibafekebevugijesel.pdfIn PDF document text
    • http://tai-group.com/upload/files/94624008886.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xapulefakerivix.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/18974734437.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/banotuxep.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/16028653420.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161380ba6dda84---63249118143.pdfIn PDF document text
    • https://protrialse.eu/files/files/97990956143.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kobitidimukujube.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/21492393627.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/32a38479d9a74f30fb7cea2669b95a91/98529636507.pdfIn PDF document text
    • https://eklyps.net/images/file/vorakegusa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mavafitite.pdfIn PDF document text
    • http://uchid.com/uploads/file/11772642655.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/gifuwotesakepumigakudiv.pdfIn PDF document text
    • https://lorus.rs/files/zogudo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddb9b6ae---47695351120.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=droid+turbo+not+chargingPDF 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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 17348 bytes
SHA-256: 015628b287331e83e0f7173a3a1270f4f4b0195d5cfc19b0a778b416f1d57744
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 10544 bytes
SHA-256: 7ff78e9d1132dcb0eb53cacd79d4c545e1f801dddaf0d9e591fbb0add21de4d1
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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