Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc652756e13804b…

MALICIOUS

PDF

78.1 KB Created: 2021-10-05 06:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d09274bcfcf36c2c84ec096e76e40cf0 SHA-1: fcb046eda83eb76c75b99309c3e11c04ff2027ce SHA-256: 3bc652756e13804bea277ab2ebb48df536c16c8f109facee4e6c091f9abdc88b
184 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=my+pee+is+yellow+and+smells+strong PDF link annotation
    • http://cesishotel.lv/res/wysiwyg/file/nojala.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/40152348809.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/jenimolaliwivude.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/55039339791.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/subenatepewuw.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92544496192.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/leduzarararasoxopov.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/nunubelanukarolaxobi.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/jiwexuxosusa.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/disazufefepegubewasil.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/babudurudad.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/46007962357.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///26534441741.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/mugebiniwopapetap.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613203c1d95a1---vuzasawepavepedikoxonu.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/20073758790.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/5450109948.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/sujojeme.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/19636648021.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sidikokeliwibumer.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/relusaveminukutozinuba.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee5b464a63---43267967512.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/30153039448.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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 10928 bytes
SHA-256: 59f79f92abc72a81512fe6ec8a6ae6aa96571586449db9873ecd68a32a93c1c6
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 18248 bytes
SHA-256: 4510829737ed3afb3f6b519d72354a41bd89b2cd9b8509ebe2e00af803def36b

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