Malicious PDF — malware analysis report

Static analysis result for SHA-256 732f4a0a04cbb53c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 01:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3600fa6aa2301651449c9cc2eb026483 SHA-1: 3b9e6c590e03a91efbd595d1402b283cd01a4858 SHA-256: 732f4a0a04cbb53cafbacfaaac56fb0f5f46ec95ef2958b597785f94771dc8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://davaocarrental.com/images/file/tinomaronisobeg.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612175cabfb91---2291963453.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306aeb46deb---88065750859.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/pejimoxowebesisotuvoda.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/figusazefipujiwosuk.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af860bcc2b5---rawodinivaxedidomisun.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/77125871617.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/zomosiwiredo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1qoeolf74h6ee75igf39ro3s7/kipesow.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/lesanuridaje.pdfIn PDF document text
    • https://ebooksweb.net/files/file/6216347878.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/du1a1vvvrhq4pklubpsgvdolpj/41259537454.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96455088361.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c5679ed7---mitojaxifakox.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/40792226930.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/17331480619.pdfIn PDF document text
    • https://badoza.net/userfiles/file/mipemunidanibamedekosuro.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gubozad.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/98f8a86e8b6157afc3a8cddc8dd983ea/5862631327.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/dekorifoxuvof.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/coc5kvf6na3ftcc2al85ng5jn4/71904678594.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d62c74b3a0a---toguboroxigalugatabefe.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/viwadozukapog.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63dfe64bd0---nigag.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/diledulumejimomokutuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=water+pump+bearing+pdfPDF 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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10740 bytes
SHA-256: 0705a8d70cd2c7befef29eed8a0080be43c86937703826aeff3c35649bad76da
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 17160 bytes
SHA-256: d6cc9056a85cd0e4eede7ce10e9c74f2b2321aad0e5ad5913b5ee87ad36ba3e3