Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef158d2e5a7dbf2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 05:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cbb651d69af81ed345d6d09059785bb SHA-1: 89a721ffd893bb67ada69d91165d9b128f315eed SHA-256: 9ef158d2e5a7dbf22b87d07514ffb541265560afcc8c980a8f6ef87801787eb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3ff5e031---66074634611.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/89b4ba04fb3efa524467ab7121c9e377/tomakag.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/wuvuxizapejilulefovuxel.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/72273777582.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/rarawolofeburusivorefe.pdfIn PDF document text
    • http://hotstamping.pl/files/file/31093848204.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilunejowekeviri.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210905_5BFA4FE252A0A5E2.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cbea0ea03---49699638530.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/70830285057.pdfIn PDF document text
    • http://balone.net/_upload/file///69096095513.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/77933070323.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xuzufexupitem.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zosijapomawafo.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/dujinabekos.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb2ba3d83---719190246.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ca73cb9d0c5c8b1ba6663d0d93448fc2/diwaxovobogaduxodofema.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/jutojuj.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210917_11308B3422EF8F71.pdfIn PDF document text
    • https://rajakedua.com/contents/files/kexojoxojetudi.pdfIn PDF document text
    • http://chinahongji.com/d/files/14806402632.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/mevenikolusanaxu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e646f1aa3378e0067825eca7b7a75c22/dopojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=song+download+for+android+phonePDF link annotation
    • 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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10672 bytes
SHA-256: 79c074319f5e32fb7fe31d9e8486978d4e4c3b9d2d75d2d06c313eed3572a904
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 17892 bytes
SHA-256: 25f2f196a0496f452ffc83a37b38451668cb027eddc61e9c2dae75e2a0d94d52

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