Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cb59dbe959c140…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 21:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25c54a7957996119aa7d1fd516397e6a SHA-1: b9ee80aba57d6692cb0032a24117a07ed7d93183 SHA-256: 69cb59dbe959c1406e14ef06330c5ec8309601f82cd00486fd5082e8f930adb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, which in turn host other PDF files. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nusantarabet4d1.com/contents//files/sidaf.pdf In PDF document text
    • http://budaikepkeret.hu/uploads/file/81181949637.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1339b71b---77051067396.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6c5918e8fa79f1cfafdb550312b28fa/23971679113.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160736a87ca1dc---2314802767.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd268806c52---88563757217.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/kabefigugitexozamiron.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/2037853549.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/99190016541.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/zuzasojo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a55fda7b74---50556062781.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mizitu.pdfIn PDF document text
    • https://makenie.com/upload/files/28747179276.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/82288356364.pdfIn PDF document text
    • http://dakmet.pl/upload/60934741151.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/gugibanobilibidizunokata.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/54952933475.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de3f98d73a8---murofomovopasid.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/48198415669.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/50621573762.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc009afbfb6d657448b83e32a6ae6b67/66661588903.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ffea6c22---tazimif.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/vebap.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/47454054272.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/78572286600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fisica+nuclear+y+de+particulas+ferrer+pdfPDF 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_off0000c68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 10684 bytes
SHA-256: 0f027e88d8af24179e22dd07381210d6e7644042cd681893a3a63020dfbecb5c
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 18504 bytes
SHA-256: 8e4bfca6bda343b4abfcefe2c7b0cef33973422f3155a3887887ec841913bc0d

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