Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2ce2b7a7f6eb67…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4c9322da4eb8a1445d80464053843a86 SHA-1: b830d90728cc30e30db48537e88014c8ed407154 SHA-256: bb2ce2b7a7f6eb67241bd907317adf27e9d0c374259ddc469599493d78c260a6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate effort to obscure the true destination through a network of disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=mui+choy+pork+belly+slow+cooker PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16093f7d2f07ef---tepevovivurigojuzi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/483241546.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/luwoguzoludafa.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/60b9f9c5d19f35d751755e7982e9e4f2/42914753260.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/558abf6e1b1a954c73e3dcc1eefd2ae3/gexemu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ff6415d1---tozalaza.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suekatatvkftlrgsb4tbulos27/86832424085.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/dibovedigoxo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/374184959.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/pdc09k0ihdh5mtqvg2uul5juvp/54523389383.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e6582f6---24336662465.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fa9485da---tazalu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89881544d5---69246189388.pdfIn PDF document text
    • http://mega.kz/media/upload/files/30472145059.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lileladiwe.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/dewijevuvawilobej.pdfIn PDF document text
    • http://tiklatakip.com/calisma2/files/uploads/renezadaradikem.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6792a7618---44489668555.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d841604f6caa700a73870a60a0d0b5e4/7606906330.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9717514918e12399d058df4dcdde9a21/45969824444.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f27deddc52be7372a9c89b704849b05f/mudidutiripevepemevo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16091f839eaa78---wopuvigoxigegimizoko.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105130828.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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 17000 bytes
SHA-256: 2ef5fa08e591c8aba9700f913a8b83d1666a23f85b41134c763adef6e7a0ed5b
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10632 bytes
SHA-256: 6ed977d8001b13c9856001f35d526792b2112e55d2c00ab79e676c059332d810
font_02_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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