Malicious PDF — malware analysis report

Static analysis result for SHA-256 238b36fb0aa81304…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 21:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d23d380ed583d0339e4019674e456da SHA-1: ecf13718457971c30d0c0515894a9701b1d8753c SHA-256: 238b36fb0aa81304280738b5f0b05c7b0e8b07592361e208637daab36e407d25
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=characteristics+of+culture+in+sociology PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2d8eee999f5f9eee586c225d12505a59/47397878366.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95451ba19116530bed9b2972bad83a6f/25801788158.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/4059767733.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6e11bqfeuk8kitdmbaluftipkd/18412432180.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1409943bf8ef8e58db855364d0f89d5a/fuwoj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mhg4gbl8f5j39ldd4n4092i2n4/52822232237.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb0f397c---xoviwufop.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92408226ed---79195351551.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03d24cb86---gezaladirutodo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uhq5nul0km2ovi6u0vkvj3rb0a/pazepilaxiripad.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wegeg.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/24646545252.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3c01d9b2---defew.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d8a656b8---95111958089.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ko9jrr9qqs5vb78agh93m64b8v/46265695197.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vaf9g1o5bpb1502cak4o3tnmg0/48962858466.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jelodalatewixeminosug.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/kenebegakogevu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a282267b9---wegonuwanuk.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4841975348.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/jeriwakomufomosafa.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdecacdea1---41407231401.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/24207122127.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/julibawalajup.pdfIn PDF document text
    • http://szwygs.com/upload/91804346840.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.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_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16732 bytes
SHA-256: f8c6f268ae0b2404be3fd194fc041abc3aab9d373adcce739918dcb330e6620c
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10860 bytes
SHA-256: ff4bcb75f393e38ec4ca1a0976a9649893ca817a9d74d4a2e415ef712b5669bd
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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