Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31b41dfbb51af21…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 382a02c4eacf321d7b63be3d45ba0d27 SHA-1: 9f1b1a9f97599d4a843c0c3d41ae41f42b533aed SHA-256: a31b41dfbb51af214dcd1500f32ae0ca44eca13d58cf5dcd013a9e961aff586d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/69c1f4f166008c5f51ccaaa975816728/34270379454.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/wetine.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/xonabavekepizu.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/mutumimujopifaguzadoza.pdfIn PDF document text
    • http://email-database.info/userfiles/file/gobugoxawijifarovosose.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/658aaf357659e0600fe13e97b65f0e6b/gipuvan.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wipuwubow.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0038cc2f2e705f94448cc4056a0d827c/lebonazizoruxumufokudiluj.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/35bdb14589bd37f9e1c4a089a0a15ed3/sasape.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1062aecc594744ddc0e1e8895bde3735/47938210528.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7dc6857d478d8685c2bb153d74030eee/28847538837.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nobozowajefujed.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/93916fa0d5aa057a580bc5420dd2c7f9/69434222398.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bb83d415---96392372972.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/94832910400.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/poluvipatav.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5550f5aa18---67912329950.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jemadane.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607519afed77e---8739919702.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a056757d121---37277795443.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210627211424.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/29b0f6b66c1fd57360b4660940ca56b8/gogokiduteneguvixaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=age+of+empires+stadiaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 17728 bytes
SHA-256: b54773fb5714f38a69ec66aa87a82688b36eef64672a2276a4a20d421897fede
font_01_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 10672 bytes
SHA-256: eda420ac9564ac584a021ee3d409636141e8d17a59c3cee89fff20c5a93fa891

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