Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cad7f05c6d8f98…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 23:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 118be37f8058595176277ee61c4286ae SHA-1: 9787550a9b48db6edf68987eb45b55e3648e758f SHA-256: 76cad7f05c6d8f98fcde43439db862245c2784bc9c8c535cd43ffa4e60c10285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or distribute malicious content. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=can+i+use+my+android+sim+in+an+iphone PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2fr137hepks19ljoplgtk111vi/89967362973.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/lolimikolenotizajofis.pdfIn PDF document text
    • http://air-con.ru/upload/files/juruxovir.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/98656148198.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/98744970989.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/liwinegaxotosadij.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109152350523889.pdfIn PDF document text
    • http://dongphat.net/upload/files/62670387460.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/57208140665.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109171050534695.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/lazowofitin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613674797322a---rabupevuj.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/84207037422.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/lumemazodunipukivif.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/84443565939.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/75018233481.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/70029374465.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b0afe4fae0afbaadd675197b843a0b58/21029925305.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/93355496697.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210903031000.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/kaziravu.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/23898300816.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/womumizejopuridi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30502bc95---wewuneti.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3d70aa0---23897659731.pdfIn PDF document text
    • 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 10760 bytes
SHA-256: 6323e7cc811cbdcb729530b084676cec18bb0a3445e66d2711d21c1de2eadf64
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 17192 bytes
SHA-256: 70f523a111bb3e9c6eabeb1a6fc962b57da33dcffedd0468919ccb00cadc788a
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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