Malicious PDF — malware analysis report

Static analysis result for SHA-256 530a1a8a2e6ae71b…

MALICIOUS

PDF

78.3 KB Created: 2021-10-05 08:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2173b2ee49887b69993101a6ec77099f SHA-1: 49b4a2bcc6c9b305a9a1463d9cd6edcc9d53731f SHA-256: 530a1a8a2e6ae71bb0153f501b1bc08cadfe1240cb8186bf7276832c3b72c38a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but containing embedded artifacts that likely facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=grilled+scalloped+potatoes PDF link annotation
    • https://vnsteeldetailing.com/UserFiles/files/3578944955.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dnq6a09e255klvqh7aomf476oq/614469420.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/77255933309.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/77316832048.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/wiwazekodugosaw.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dipazabutuzel.pdfIn PDF document text
    • https://oasis-travel.ro/files/50490329574.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/vowakud.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/fupumemono.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/6284213947.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xalobonuwep.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bogefavevasagurugujiwu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/ketoz.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6ebf259dc6cff3e3cb11caec98e0af1c/50296839633.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/99297274428.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sewegugoluxuxamujovotep.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/wagivibajevi.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/59723714316.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40424827375.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6d0038095---rojoneruvo.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/74682481660.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/53112407238.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/furegujami.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_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 18804 bytes
SHA-256: ed49ccb50d46670cfe9ba1145df34ce8ae2d9668038312de9fa3f436754f9390
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 10444 bytes
SHA-256: 5e690dfbce0af96521fb1411c1307c4fca86308b784d5779dacb447c1b700f1e

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