Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5cecd05bdfb9f0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ebb7aa5c6d090a0dfa4946e73f84169 SHA-1: eecf9478c0d6b8741f76cb149fbc8752241054e9 SHA-256: ac5cecd05bdfb9f0061904866fbc6086958a058c56c706ec8cf54e1296a91647
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent of luring users to download potentially harmful content. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=iron+man+3+live+wallpaper+premium+unlocked+apk PDF link annotation
    • https://cukimentescukraszda.hu/files/files/bovanezom.pdfIn PDF document text
    • http://philboyd.com/24052086999.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa5458e9b---32861943612.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210907151940934311v0b4cpbu1w37.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/wizinewinomuw.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/78913410381.pdfIn PDF document text
    • https://matrixx.lu/images/85050352295.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/debevanipor.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/65106208427.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jabopizekemaxefalemiguli.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b95e4439f---6283674530.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/95768946201.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/kigefagomepuxanazoxinov.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019c18333e---dagonivisukogibomexerobe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319243d6452---dabopubumobatufiruvuraj.pdfIn PDF document text
    • http://analhospital.net/file/files/55368170945.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b901e473ef---nezoresuroxufigez.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/87654890843.pdfIn PDF document text
    • http://artepcb.com/upload/files/4471825953.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/potililebixotexakanibas.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/lofijinisab.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/78037649768.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/judavimanolutapo.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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 17952 bytes
SHA-256: 6ee0421aa557226d4bbd9d64440390b7979e9f4e5bea1333de0d3bdbdf5e20bd
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 10876 bytes
SHA-256: b72fc16bd4ec8271a3f21a96ed86e6c07cc6b330309b88132a01de7be5bf5ef5

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