Malicious PDF — malware analysis report

Static analysis result for SHA-256 970c99ea6bece190…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b27e2d7cf229eccf03ebc0238b3a55a SHA-1: 4ff231e881ab8eb57adf36a2a344f7a2784a66e0 SHA-256: 970c99ea6bece1904f1ccec7f8ae0bac67c4398ae0b75d2bf2fec7c664993bf2
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://cisseo.net/userfiles/files/porolo.pdf In PDF document text
    • https://dsverano.com/UserFiles/File/lipekejulowaza.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivibukodafazigoxupamizab.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3dad50c12a5f4335ad67a517512b4d07/80309564293.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/palibev.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/95435036104.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347dc4537a6---28119176018.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/xomoveruwowub.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/24637893952.pdfIn PDF document text
    • https://yellowstonewildlife.com/mafigazemuzuvokurofojaret.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fakowavefupobomowaziwo.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40567702939.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-23-10-33-17.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/38811429250.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/nemanag.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/rusoka.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/44603984750.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/duraredadivepevarirole.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/pebigiwufixiruji.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/51454369061.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/powifewuzavakageguw.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5739d8c165ab35e8275f8d7f2c433228/xudekuveroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=windows+8+download+free+full+version+64+bit+with+keyPDF 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_off0000adf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF0 11496 bytes
SHA-256: b8fca5b5319ab560e385e4cbfefe3f243e5a940a4dd078003d83df8143cfee50
font_01_sfnt_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 15052 bytes
SHA-256: 9011cf7ff404c1cea5661df7d95069dad18cf76b9efc53de0121cb9f01c4b426
font_02_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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