Malicious PDF — malware analysis report

Static analysis result for SHA-256 a134732c8c7761b9…

MALICIOUS

PDF

91.4 KB Created: 2021-09-08 04:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28da985b2e139b5cd52af951c82ce1dd SHA-1: 121923bacb0f066f1e83193ff23be2f457fd218e SHA-256: a134732c8c7761b9099c3f21a72d803bc5e71b739001cf85914149947650cfd0
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of multiple links to potentially malicious content suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b8e11e1651d47d0ddda804613b75f68b/kilatavulofagipe.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086e2dbc2e1---wixivev.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef36f09135---zugatanadofiwikarowelifi.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/wevunopaxefipi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7889e1cd---xotedunozut.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5mojui5oaeqlv7q5rcdb0lbhn6/niwaduxubu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/bupokikufuvo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be57e94874a---50561936110.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lto2use164sbrgnn8sml53aeoe/50237364775.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e846c49463f---33213756964.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5db439c22---29622606382.pdfPDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/ruzotewufefije.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c4536817---71683783056.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/49591799002.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekjfdalbp9amm80qm8t7umhajg/jixodilokufuloxakatexe.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/70067187505.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b075d0b4fe9---nutebesuj.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/14468815906.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/73878031017.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1628585955.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0df7933b461dd888ecbb824face197cf/zigojuravobop.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lireretedekof.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d34c2c3ad9b0f61935ccc65681385855/66927449218.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/nomawor.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160777dcb7ac98---zapinelewupofuvipadirapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=learn+basics+of+java+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_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10760 bytes
SHA-256: b99a9b921ca9586177ce238fb9b6b4bafc4c53f95bebda7491e5dc78741ca973
font_01_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 18580 bytes
SHA-256: 1c947b6be54afc641f7a6d8897a38aebba2f39fb7f56deacb4c537a1f8b7dbc5
font_02_sfnt_off00014835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1