Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ed0bb97a031858…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 09:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b4132a6ad6e14d7d2c799c5fa00f902f SHA-1: a00d803a27c6a6b3f91d2f3c641bb62660f50355 SHA-256: a7ed0bb97a03185825b77386015d7d5ce2363e8aea64f9b63ea3e9dc948e919e
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=pc+hardware+problems+and+solutions+pdf PDF link annotation
    • http://sedaciesupravy.sk/media/file/zobozeloxisubuf.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vewaminuteb.pdfIn PDF document text
    • http://vce34.ru/attachments/file/purulapinoronuv.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/24285424801.pdfIn PDF document text
    • https://resicolor.com/upload/files/gurojoxalidemamizo.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/zaruza.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/32102226262.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6685ebb8c67699299ae72b5d5a4f9887/59695929808.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/58340644250.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/66920653209.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dabapetusir.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/56019387081.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/63594029859.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/zedimavaxori.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/27286703974.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/89400568516.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/welumanibe.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901014537.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/21035895657.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/62185919909.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2dfd10dc---3479647139.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134338253ff6---muwadonojapedolorit.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210920235639.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/13698710085.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 16484 bytes
SHA-256: e81444c22b130ee9bfd924054a841d93354eeb6a0dec72961bbe1a8c177bb8cc
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 11212 bytes
SHA-256: 419d6dc6f7571f5c349f9c97afa47e41d1ab961a4cb9218533738aff73451136

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