Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83d7449a9b27e1f…

MALICIOUS

PDF

99.8 KB Created: 2021-08-10 13:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e459911e8dd1bbcc52624f51ddfb90c7 SHA-1: bb02b5f873b6605a3aa60d08b73adfcda35de170 SHA-256: b83d7449a9b27e1f6c144a331c8bdd1b946b1e7d3e3f1ec1dcd79a795e40ac29
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to potentially malicious websites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=respuestas+del+test+de+domino+d48+original PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087aefeb5395---penemiperotuvozuruxadurel.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e00790bad9a---36516860484.pdfIn PDF document text
    • https://people11people.com/uploads/File/3202693993.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bkefui7nivgqgmmh08k82oe2m2/zilidedifomizagomotan.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9a0893d459547533bc146e067ad595ef/tesuk.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidexaremifojimozizokeg.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/56609746258.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/32851081675.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608150ca33977---62057712458.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92923259283.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/dexobod.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/51743882737.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/sepozodol.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/loleliwoje.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/21813279393.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b56ab5b439be65c01d220280bc41e13f/88236268298.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/kaxokud.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gakerodirarolutifeba.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608035ee326d4---25429175308.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ub5u89gdq1f39g20b0jdodrvl5/26895105383.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/welilegisetivosetadulir.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_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 11164 bytes
SHA-256: 2162f44a521cc2e0ff1c201f80ecdbc858094a371cebd8833719cbff8ec25bf8
font_02_sfnt_off00014e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 19512 bytes
SHA-256: 2d040f7ae58b3938474d599e1bd9deccd10e9a1ff12c7006ebfdba9c5b87457e

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