Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad46e4da2db017…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 01:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba074a8e45da0a135329acad29a596c7 SHA-1: b67df25d81466c00986c037be2ddf933239d3578 SHA-256: 4aad46e4da2db017c231aaad392a0bbef15ca9fd2eedb125b3689012535efa93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=subtracting+mixed+numbers+with+like+denominators+regrouping', are likely used to distribute further malicious content or conduct phishing attacks. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to exploit user interaction to lead them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=subtracting+mixed+numbers+with+like+denominators+regrouping PDF link annotation
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608509012564a---82805966658.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/55be329890bd0d0fe0e115770d40cc40/zejoniva.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/26f21c17a0825a31dcf8697ca1209e9a/35803742510.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/04e87f6b2fa7c55c16eb417ae106ca0d/ruvugakar.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e932a9034d---5665988076.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160badc315b37a---698435468.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852005ae993---50858931885.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5fd0630b---ranunavurazor.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09ce39e9d---mixalerupokologese.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/gunovidonawetaxodop.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a35ee2e3f90afcd630acbf050e3eb43b/57553876981.pdfIn PDF document text
    • https://hgb.se/filer/file/55951594121.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/92028532554.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e400c3743b1---15074402565.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qiv0bgg4e1po12ssgjifreoib3/fajijidabufoberufedu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b8a3df361ed1e0c1de1514ace048c42c/95278600947.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/tupokeza.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/111143218ddd00b0595860928c2f6585/jufudu.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/32058500169.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160934f2a59d14---sejivokipepo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a449d2b92bd---motixowesazefivipaxukala.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160835f9cdce41---95009054765.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tvfj9kekmeqrq84e1c37pjjnot/pavutejusufonanatasimawef.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16776 bytes
SHA-256: c6a70bd4284971f01f74600747fa29bf731d65f6e08bb98c50471c31c84949fc
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 11556 bytes
SHA-256: 87145e23518eac185438ea486b2f644ff96c4051c6b24e5b1af2ad36d754e622

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