Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d747d0b72e84a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 10:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf92489373bb045c23293ac2b62bb967 SHA-1: 899f359eecba23140b89277217e473f4825d3b23 SHA-256: 225d747d0b72e84a36b5729c1f006abd0636579e9aa25d1ae47ec4d5072b9c58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing embedded JavaScript. It functions as a link farm, directing users to multiple compromised websites, likely to facilitate phishing attacks or download further malicious content. The presence of JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=moderate+ac+joint+arthropathy PDF link annotation
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f16ad8465bdb237675ba430477dc077d/pemeperukudamivuvube.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50cad4906---77281974685.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/somizasup.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/fb93ed7204fedab10d4fa001d59bae13/rowenuzesivu.pdfIn PDF document text
    • https://jetaime-shop.com/files/notajimomadonegokaz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bce408a44df---39870388645.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/digazi.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/83901971199.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c070f16a7---42414697961.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/87664024528.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f1b5d458---dotuzukepi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6b6a13ba34ac6c642501df963a95782e/76152270342.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/ninumamemafarij.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/28716713782.pdfIn PDF document text
    • https://maturana.cl/upload/file/52094516799.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/11397321598.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/88976286267.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/45684005667.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/zetifavupugekipewuxeza.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17de527d9---19796433763.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/xebufakomumigoviruxifiva.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/34890028368.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b7573ca1b448db672d9e680156b7809c/7314869415.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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16936 bytes
SHA-256: a55553eb4abd522d79b3b9096de1a561447e5c1375d8a8b2bf1b22ac2d706f8b
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10636 bytes
SHA-256: 5f79221b474f9a2884bec92db36da4adbfe8391725f4ff06996dc1dabff24272
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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