Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7a443588ec125e…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 14:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 597e9ae69698b1dffc46e34492680ca0 SHA-1: 3ff8d8d241d92bf8cbc0f4b34718051dba843dc2 SHA-256: aa7a443588ec125e19ddb6b87177de5b4ed2f7f82e924e580094d2b7b8b8f92d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lgrmnbl6c0ah98iqd9htfs532p/mejidotegagem.pdf In PDF document text
    • http://paklya.su/design/img/upload/file/taposeveberizadaso.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/97586783789.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/002e5a4bebfc70c0bd318541db098e0d/bedubudiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714048ecac5---zadolokage.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca866eafa2---ligabozuxudokusiw.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/mabodofafujojulamotase.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/jokamigefawibuxik.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/71488269274.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9262sifmf5p7vq6gtea32ge03q/kiwemakikegopetuf.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rgn28jnu4af8l71i6s6k0ictmd/82862243050.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/1848280540.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bujunukazedatewobegu.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/92883758332.pdfIn PDF document text
    • https://dm288.com/slicice/file/82262870693.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/20e30a1ce31118fff07746935056f05c/vupizegeteseridifedopewen.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/47391602962.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96d72c7f---22258268597.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e3bf2cf---megaliweta.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jivikonuzuduwube.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/41238511188.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16100874a1d5e7---32677875489.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/33937576665.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a33579e8731---kekuzeteditofuresanujub.pdfIn PDF document text
    • http://gyobel.itpublic/file/mugugisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fema+is+120+c+answer+keyPDF 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_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10688 bytes
SHA-256: 4ada1dc200ba073f83f937e52a647a99dcca72631f43f11d27070a5cc40006d4
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 17012 bytes
SHA-256: 869c0cea5504e22b312b412e75a17d219736dc6727490ec2e9bbbfea45514644
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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