Malicious PDF — malware analysis report

Static analysis result for SHA-256 545aa1322c8d3ccd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 06:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfc824022e337830ec4ed8d319cd657e SHA-1: 81266cc901bf827e1454ac5737046b6677f87815 SHA-256: 545aa1322c8d3ccd8deb55b501f228741a91d085fe2a6948ae58d667b9f62229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple URLs, many hosted on potentially compromised WordPress sites, reinforces the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b31cca375---76204057976.pdf In PDF document text
    • http://dywin.com/uploadfile/files/sidadamivegubifafarewuf.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/46825046501.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gasozoxokavodoxaketemoru.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/402df7bac4023bb45716ce24dcf015ce/vusatoxivajuwuko.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad30ca958---zudodilu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/10802431633.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/6034099094.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/44355691679.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907003804_nhlczl.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/savolunetutej.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/72140374729.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/76615398478.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/mazude.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/86982659465.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/19647596025.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/murudinu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613673119174d---86786289080.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/fuwoxejifuko.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/sexexujamudodevibu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gisoranojuxudakutetexedi.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/xulimuridefipu.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/40480095869.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/sulugomavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+quiet+place+2+movie+streamingPDF 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_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 11132 bytes
SHA-256: 43ef1db222eaec6e650cd88da5792157de6983832d1a15beb710430736f66cbb
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16908 bytes
SHA-256: bcbd2d70af0f9e1a7dd0dda2dfb473c49c48daeb948797bd8c5e9c04404cd0c8
font_02_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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