Malicious PDF — malware analysis report

Static analysis result for SHA-256 c976cb7e52c922c3…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 22:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af6e98b14c8e3901469e4fd9fc08a13c SHA-1: 464e5c93687ae7d2205a112d0292996c8d1570cf SHA-256: c976cb7e52c922c3818c6a26e8db2f7706807ed84714beec572f9b2a9a7d0c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised or disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate these redirects or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://suma.ca/upload/editor/file/pudaxosimidunuzap.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146765ad79a7---66542572760.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/58676959744.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153ae13935be---motiporigolitafenili.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/lubujod.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/td26bmg1j9hgkpcfieo1sbb4s3/69941891717.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/95918545794.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/51634226689.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nojolalover.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f290b831b---2389992232.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090204523295522.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/dobulobovoj.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/32421107524.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16145e643bb30d---13699537170.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/debumigudobo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/tugeze.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/giximitoligetiduku.pdfIn PDF document text
    • https://www.confirmedtour.com/files/24408841589.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/11380566290.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/89953878814.pdfIn PDF document text
    • https://hssanesteban.cl/files/73052168211.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/43424617465.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-10-1/20211001075339940886.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d1a4048f3---narivodulanifolujaziwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=maslow+toward+a+psychology+of+being+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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 11232 bytes
SHA-256: be28423ff643db7b1bbfdf4ce68d3ea8e8dea550e247ec5cfecf1f6095b0fbd0
font_01_sfnt_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 16252 bytes
SHA-256: 568d08ec3c66789556ab410f2127af648c93a3f653e18d88b9966f27930900be

Open this report in the interactive analyzer, or submit your own file for analysis.