Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e2dc054f05a91f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-21 16:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0a5b41e8234a661d52d2a7d91cd1817 SHA-1: d99aebbfd0e3d13f5704c0bdadef70dcf81f1ad4 SHA-256: 66e2dc054f05a91ff54b47c4e1f208dab1c73a78be4f0d58b8e045012157de9f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be SEO manipulation or to serve as a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://angelescare.com/userfiles/file/89249669581.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfb86e7a5---zolebur.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07e337835460ef93d973b05a06614539/87246265264.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/bapor.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///sijimibugedif.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703491b21ad---62221738122.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/11413585192.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jb3qt3hc4la92aadcqevaushn5/zifetibeveradibazibesasob.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/13750687799.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce188c24b71---baselorolelov.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c1f4fba46d2ee39f39d9f57802b85a8a/wubewokezuxipixuxo.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/64295816023.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086933ea4b13---rirozuwebow.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/bedotipulovudat.pdfIn PDF document text
    • https://jss-moms.si/upload/File/38494641542.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/7457541152.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f8462ced690f9dc10a41490274b2a17/45094197336.pdfIn PDF document text
    • http://jucal.es/images/file/vifotiwedeluk.pdfIn PDF document text
    • http://guowangcable.com/d/files/48338906190.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e45f9336f---28808403786.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee23f1da69---rafowedexafuwovuvogomugu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b00bccd9bc2---pozonozumuva.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504115257183607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=conversation+with+old+friendPDF 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://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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16928 bytes
SHA-256: 2d954819d977aaa03239fbba24a65915e97b5afb2af90d5dba9beacf04ee4b24
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 10632 bytes
SHA-256: 04ccc16b0ce9ecb91c036b755e90deac683b1737cc9ac01e91e2e0ed04611874

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