Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1a7456acbe7d13…

MALICIOUS

PDF

95.7 KB Created: 2021-07-30 14:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5b676e3a575377943e8913be22a20ac SHA-1: b64b70f79a3a850e77fd4cea2b95a5bb47185059 SHA-256: 9d1a7456acbe7d1386278421fbdd89b745ba396c9aa0a6832e3b1e6d2a287f1e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://sequirk.ie/userfiles/file/gulixegobimijeb.pdf In PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/fosifuk.pdfIn PDF document text
    • https://chp-travel.ir/data/file/10440621847.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a653fe5ae5a---67208530323.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/aht22svhoodg7onueios1a5tu5/2196074664.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wugolilawemojujogebiko.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vagawetegubinedasa.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/tinoparosed.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/33860087675.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/64fa0c8ce48ddd57fc54ef3d2f5a95c9/nufutanofumabuzewudama.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/ririn.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/guxozikozojawopev.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/vijidekiviwebifuporixu.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/98015389151.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3ff969a1d347d857b0e48ffbf29233f1/93622049739.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/vulegaduzusuwinoz.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/tphk42sqps0r5li1067efp7ll3/24612978075.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c35d10c46---28925905780.pdfIn PDF document text
    • http://soupworld.de/upload/file/61424206535.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/40821626768.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/22966929907.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc9bd04fb---28529384617.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/81609514143.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/54960264150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=super+smash+flash+2+unblocked+weebly+66PDF 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_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 11588 bytes
SHA-256: 1c80bf42d874f94e9d93f7bf64a7d981be79e55741901cb1f8b9bc2162faaa74
font_01_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA6 18316 bytes
SHA-256: b2c404a1d6b8437a537a9dceafe0cb05b98743d8e3d1215540d94f60ab120290

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