Malicious PDF — malware analysis report

Static analysis result for SHA-256 4844eade42605f53…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 18:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 025e1b7d3947f62c3a264faf88c4ce82 SHA-1: fbc11d8b871a7fce1ac8899adf93a934b2780831 SHA-256: 4844eade42605f5362e78417bb0b73f32980e9f2d1cefe2593d1d8919f6a360d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ded4a7bf---49403256098.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70f8a2ca8---jaguse.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/78290282351.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/nirukekorafega.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba9dea27---zaribozu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hkuul9ehdfpbjj4gti56rqtnin/52381751969.pdfIn PDF document text
    • http://mp-journal.com/media/file/dotujub.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210630040444.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80ede1604---gotobijoxelemalevifilan.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/97350912399.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e342c808a---15903019071.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b1e1f75e---varorekuzukone.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/1268808208.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/80606137726.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/26103755902.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e01d7e592b79c5a9f5e4fb4b0667fd73/88908417047.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/koleduroludak.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/25071203148.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5d684fa33---vumibelugabamibiser.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/gabalafizewelidunufad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=escort+redline+ex+radar+detector+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4ba3a0bf5e080c36943a5fc876c675eb/rikogud.pdfIn PDF document text
    • 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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18704 bytes
SHA-256: 17ea3006665893c88d5c9b8c101e928d1eaab817ca18a3856a8abda49a049b3c
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 10716 bytes
SHA-256: 1a8def15bef4b3c8599d64f4dbe73c7f950b11ec1b0bbe6813cd260f5ac32f3f
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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