Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde79e2368ca1f3f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 09:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 747dffacf3860d45115c2f478ab4b8d1 SHA-1: 61594ddd057cbdd471545d3c286ed9eea75a28d4 SHA-256: cde79e2368ca1f3f5d977555a6725ebdb3a10810b06e8a2908c602c123734acc
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the presence of numerous unknown URLs suggests a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0bd8f85f---28666547399.pdf In PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/37283765646.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f099c8232---6424966795.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/novezifaka.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a375035531b7e03cc0de19e892b69fa/61495330022.pdfIn PDF document text
    • https://jagominum.com/contents//files/73704633019.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/17308185774.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a1c21311---19437638356.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/21345928484.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/70377528378.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/66615669998.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3fa10baf1516433f250c162a3a4ec952/97829310027.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/94867666230.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efd3c5ef679---rixoxe.pdfIn PDF document text
    • https://dafelia.com/files/dulevab.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fofukiwir.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/170n1vjet0fb6vounvsfnje7m6/budopomuzadujegupatezak.pdfIn PDF document text
    • https://ovalpolycoats.com/media/zekuluxiwomepimugokevaku.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/48256346278.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/85254300905.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7223023f9---90895120776.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a33be50dc---76960230948.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vawir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ubqari+magazine+november+2020+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF77 16372 bytes
SHA-256: 6c0297b5fb9d377f106b57e0b9434e301bde77185ef581366f06fbafefeff55f
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11324 bytes
SHA-256: 1c5dc4a068f92bf48ad07a03810b665244a07ec223a8e9399b3576b9c1883aa8
font_03_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 20876 bytes
SHA-256: a13e91073bf99fe955cbefd58cb8d9130c02a1e7aaa98dfd21ac44cca090d5f5

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