Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e50397fc939ba72…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 03:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baae642ea18ffccb529d6b14b9bf3895 SHA-1: 453221df2aea7ae83c48f94b22f4d1930464d039 SHA-256: 5e50397fc939ba72b3b769d2f857315eaa8600c77937ac157d28ac1e9382b284
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised or disposable. The presence of multiple PDF link farm heuristics suggests a coordinated effort to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/fajuganigopijitizetepiv.pdf In PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/89625303653.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/50285414953.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7ec9917f---lewimoxaxaxalafuta.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/zewuf.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e0ea5e2c---navikituza.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/34105986210.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ef4b8f953efbc545777363daeb6b426b/nujutolofuboxa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b8d6c7c7f---vinumunizepegufado.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/koboteboridupe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2f62405a2a775390bf4b08ea44ecd886/noxegu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/bowale.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/kuradafaginipopuseb.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6255a271b---nugalizuxa.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/tp0gle00u2jepceu7mma4qev8v/41188874869.pdfIn PDF document text
    • http://glttek.com/userfiles/file/9418225191.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7a79e9e8---goxolijotulejerugulamuxa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2a9e861e---36280263049.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/bidevepexokaninogovituz.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/9927809196.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/ninamokanalarosofab.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/wopagutusuvutuwokoji.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/47667006087.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/woronalamolusarunexeketo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=california+rental+agreement+pdf+fillablePDF 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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 10844 bytes
SHA-256: f7b3e8a17eda718f402cd4098ca5aaeb80910ac4d61c6d85b69b9d6a1a6c0386
font_01_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 18376 bytes
SHA-256: 9f1dd8f63e85cb99381e142dfabf1cba7976f81f7cc501e76a48fcdea244ef3d
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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