Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cf9a7894aaee79…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 19:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fa6b7993ac5f5373a0e3898c9357917 SHA-1: d827465e2e18331f62c98137edc996e23a32857a SHA-256: 05cf9a7894aaee79efa24f828e6e1dd1f1591652af65441b90c1508389b7302b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristics indicate a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of embedded JavaScript and the link farm structure indicate an attack pattern likely involving spearphishing attachments designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50e3b5e24e---44774047604.pdf In PDF document text
    • https://excore.hu/ckfinder/userfiles/files/rivalulederi.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/demizuvegudeluzozo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a564d6d2f10---xukelebovikokivajazujexak.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/sakumufofex.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/ddfeef5c7640707031cc570618ec39d6/zejasadewufe.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/11292609542.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/taluneva.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a07ac7b71---tusomibu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/42597465985.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/16695077651.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6aaf32e1---romalejepeliwuvozagopu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210807124814_e6hsou.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/difikatabugelojotig.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/tavovesupuvedupapofe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/rekomi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/be195ed4aaa6e541bf1f1863eb1f2b1c/29625129466.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/31422439538.pdfIn PDF document text
    • http://malifer.hu/upload/file/90940219901.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0ad0326---mumokisatapevonuviloridar.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/sekevikukovarulajilopor.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e1a020d94076dea056292fd60486b1f6/jodolitata.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/60491000980.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5d6fe8a7456e30064307fcf2c522cbab/6999710711.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/35432534448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=quickie+2+lite+folding+manual+wheelchairPDF 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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 18908 bytes
SHA-256: b49e2da1cfa319ae239e1d700fa6d51340e81bf9f86d69ae98aa33cd94c2b872
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 11212 bytes
SHA-256: c870bc750becdf7116850433974de26b89b13c74df51a185ad2f9aea34b30dbd

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