Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4447003aa766e1b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 16:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84ff7c2efac7a206a50da90b9d56c61d SHA-1: 5a15ee5fb7c90885a17d2e644a3aa63ca041033e SHA-256: a4447003aa766e1b184d7d2dcca83c534f85b4f2c0061dfb1c309dad743a344b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially to spread malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://allytemp.ru/uplcv?utm_term=holy+city+heating+and+air PDF link annotation
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/vuxuvepevesozimakozowit.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fccf4441537cfacdd8eabe07e42d25df/fawozi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kelonidagawavo.pdfIn PDF document text
    • https://maisonforville.be/documents/file/16718548725.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/furebajujifenanu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/41276624415.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/31434130217.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1897a0383f222e498137b98ae334c48b/mudewewujuvuziv.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/8157822022.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210707120159.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608229a8a953f---jivowo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8baaf05c3---sekaxetek.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c48396c0c51392363e393e363c3f14fe/36983897576.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6do6mblee0keo5apkbf56uoeed/14495029281.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/kamojopirodukarivusiluw.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1um766ohihpc4ehurf5sffs8p7/pozumekuwixagomabesig.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/18f6989162ff86aad3dc1d6e6a13c70c/moguzejef.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50011297d8---gisupifigetarovi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f9bbac62---76498235811.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zulador.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba86918b877---73402268174.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/figasebabiziwapug.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc2ac7431---29745783968.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d8494a4ec---56771547465.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_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 10588 bytes
SHA-256: 9d3f99803e7405ce79c26dbcb48e9aa9f48367453d1bf7de73976321b0d16a6c
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 17124 bytes
SHA-256: 4b427864548d316f2e8e61a11aa055eabfaaa840827d62966b727a96ff3ca035

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