Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfd5504e516431c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 16:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6114514130a13e14f4be7b7c2b1fc0b0 SHA-1: 08b706e491c2f9bc5cebffcbbcdbf74b281b00ad SHA-256: fcfd5504e516431cfd8130a581039db212399f5461ff0f651070903a11e1e22b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=exercises+reported+speech+with+answers+pdf PDF link annotation
    • https://ortechindustries.ca/ci/userfiles/files/wetezexosixibu.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/49381322646.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999b3964169---bexidixudenojaforeke.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/91296244040.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/08ab5f36e1c97075f3a2b177b4f5260d/sedatoxadukiworo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070409243573499.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db4f01f92---xijap.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fd3e2b2d3b995117fd118ad7d415f89/jiwet.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/20147037509.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36938616016.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8253c0fc0ea89059d1484f559a0fee1/98968127627.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc10933dcd---14599714235.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/50248743923.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/fusesewonofuduxera.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef924403cf---7672798963.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/71973316504.pdfIn PDF document text
    • http://pedraferro.com/files/files/zugofumufop.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210620025907.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1871940455---2640544123.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/94426620069.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051609275973499.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/dozizegisatidu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/76065767292.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/3086511065.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729b44159ed---bixodo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a060589d7b---37095458209.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/23948807011.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wijumuzulusuganozana.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_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 10844 bytes
SHA-256: edd66eb14d449054a27bc980b20377dc663546d77999438a652cb42b0ec1a804
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 18072 bytes
SHA-256: 99e2053147fbabfbebb1b3dba755f246b544fcae0e1fc30440be2d04be37a59f

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