Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cd996f4142c0d8…

MALICIOUS

PDF

78.0 KB Created: 2021-08-20 09:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 748dd0e8844e04f96bc72c01ef5ade77 SHA-1: f190ea156ac1057337416e0d9a2f76f6e8b18dde SHA-256: b1cd996f4142c0d89e77e67d95b3f0eab0bafcb141b79ed177b764f358a56b5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to evade detection by using disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=how+to+reset+a+whirlpool+washing+machine+service+light PDF link annotation
    • http://csim.jp/ckeditor/uploads/files/56152399415.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/mixasugujuwufe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06d27f7ac---50136078682.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/53846563777.pdfIn PDF document text
    • http://capital96.com/userfiles/file/64925542372.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/17103811370.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/2854000045.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/10345080721.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/mitefefapewivifipazijinur.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/miker.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1eff9guku8rhldprkv924h8174/mipijurut.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/41005453316.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/bedibugidomusumunos.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/uegdjka1u9r4qf4qq069urghmr/89572320515.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/turikazabovo.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/sajajog.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160725ca524c44---90575045325.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6c0ec074---9188812092.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/suzej.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/43412877109.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/50251059201.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/32720f4e55b5cb244ec1a16ac1f2013e/minimugopemotuxitavaxiv.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790dfc64396---42454803548.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d092f3779---niwosofig.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/19018425834.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/37676609037.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_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 16384 bytes
SHA-256: eaf64df9941c41df3881e381a902953157e05696a4e3b50f651f25f790ef12fb
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10964 bytes
SHA-256: 3268128a97ba99bc0105a9d60239309ea464e1d805c0e9af350848ad7bf6da1b
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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