Malicious PDF — malware analysis report

Static analysis result for SHA-256 37520f0e4c5385b9…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 20:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: adedd7a97d66d34f8d960ec90c20c459 SHA-1: 4f6504832860f5c05aa47c1f85141082a4d2989b SHA-256: 37520f0e4c5385b9d70d4a0d40782a5108ed2d8062ce1c37a45e6fca1ba6b6c6
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 detecting it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e2adf429---kedipavoxikexuganeja.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda2157d05---lumevegediterunoremetuga.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/41688331022.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85cb1a3d---57189911583.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe4507901---tunedigubalixudime.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f005b0cc---85352093964.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/12718660459.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a90511100b7---52062132821.pdfIn PDF document text
    • https://bataretak.com/img/files/file/gulopizufitoxol.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c655182536bc921865fbcfbd81abe9f1/dujisawepixaribelisewep.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/97297773190.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9b8a6001006e5a6c3d65ffed14573051/seduninigijuvidamekuxow.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2da32dc13e068e2e5376cd81001f76b0/8441720157.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/josixegapariwuvajatofo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f70bec6e16fc7950bcb0a300360fe734/kukamarutidolujife.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c249681c234---28419934950.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160708fc6df1b8---6335560109.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e1f84b1b1e0205b906f5bd8510d9d2d8/99006799931.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d13e4d37c435bf7d467aed740d52eabe/detanexepumetotizogukiti.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m3b56u3kka07t21hln916umkto/53241811945.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8702d4566---delelamazijokufav.pdfIn PDF document text
    • http://ridendo.cz/files/file/95582537250.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/10e1b8c5fe185c26ac7c859ed8a33e8e/jiremusezezimafilakipigad.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/59321383498.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd596542c9---3086777558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+tamil+melody+songs+downloadPDF 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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 17396 bytes
SHA-256: 6d8cdf9be0f4f6ee076d8974a43311cbe3b32e571deb61758c404b68653b0b4c
font_01_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 10668 bytes
SHA-256: 4089e831827742ffa51f2b9d0b30481371b4c039aecc109fe9610f2de7a49df5