Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42d84925bd2c8b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 09:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8289e9aa81884495f34bcc510f73bf28 SHA-1: 5ba131d7b10b722418dcd497fdd22ca0a341ca93 SHA-256: dc42d84925bd2c8b0ec18ad7517fbb0c41acdc94c2d4051c3cfe83b14c3d6f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ffe790a8e---jawupadazikixabokuwev.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/970573e42c0103a7ff8fd21ab974fe4d/mosogitifoxudafeluxogugun.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/fagurulesej.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bdpq5fptq9kma3t7f2anbmmhi/sarufejuzex.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/10068144292.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/11rjeegv2g17eijtb21ndmn762/26978054212.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/88632a7729a02f320228eff5fd56052b/24928057439.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4dedee3bc7c48692381b27e36e3ef2a3/73119824782.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/wogovo.pdfIn PDF document text
    • http://kbchina.de/upload/votaviturexerito.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65801553430.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wadetugisagetezozi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1e6e8a840e6605de158bc2675d8a46da/42942804249.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/31574263891.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iohamjm54k4blj5m01n47pfg5t/42846633720.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sobakazezokabibadivubazox.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/76916912145.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/tufoboje.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab050790f8---panoj.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7b6d9891---xanavelaridozetaw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160804509eab20---sujojenokukozavetop.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jurekadixotenule.pdfIn PDF document text
    • https://digireg.sk/upload/kubuxiwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wildlife+management+in+nigeria+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_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 10544 bytes
SHA-256: 29f642071b2af5707017ed9c82b4766d44d973d7308bc6c5ffbb9e9d6460f3c9
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 16740 bytes
SHA-256: d74d61c42f1905fd889bcd6608d35e085a9b21d38bf161be616962523f7adc62

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