Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bc347d526d908…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 10:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74e6cd128af45e3b053f2a9b6149a1b3 SHA-1: eebbd6fece8a8c965074dbe113377cc6f02af325 SHA-256: 3d1bc347d526d9083df2c0b68afc9e6a32de719745667038b617806f61086374
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to external PDFs hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The high-confidence ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bdata.vn/upload/files/fogatepoli.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/30875876068.pdfIn PDF document text
    • https://samudra99.com/contents/files/41895143303.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/43274515700.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9351fa9c545d5c162ba0a2bd44c29c96/53013130229.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/4164922449.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/mitexomikuwuzobosido.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/talekeruris.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/63583129176.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/worezasovi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8309caf7bbcbc9805818c50b00356a7a/sujotep.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/pizuvafoxulokizejudomu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bbeeb484111b339e09964bdeeb2b99f3/72561986256.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613546740e630---nozasizegasewebo.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/93253489055.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/4553619378.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/56663114682.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/xamefobaxiwerez.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/89413237780.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/nazejawobadalimado.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/bufivanena.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/3309149914.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/90118583564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=recognized+languages+in+indian+constitutionPDF 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 17524 bytes
SHA-256: ad083554c29fe46d20810fc5a6c48d11ea61f71bd7ffc7cbc0d4c1d346c9e592
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10652 bytes
SHA-256: cf42f0699012b00bff44c59f52267ad02373e424b0aaa183483e991a1373c713

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