Malicious PDF — malware analysis report

Static analysis result for SHA-256 22189084d35c000f…

MALICIOUS

PDF

114.9 KB Created: 2021-07-01 15:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1af2d979f39614a2a64d96cf83c15261 SHA-1: 7c76c2898d844ebb1bd78676ce7683000f701f47 SHA-256: 22189084d35c000fecc32b0079bb0564ff23bcab898a7cbd1b283df4d6351cb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites, likely intended to bypass gateway security and deliver second-stage payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to evade initial scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9215

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32f6cf6e3---jozazijamidumekisarododu.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fbbc9099---wuwuludoxujib.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/kotevovesagubadabenarubu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jinaja.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3tsa4i6pd1ttu5tjtqn9ss18i8/gasekajoreres.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/sunum.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kexalotelamezisekojo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a8e79ffd---17483109208.pdfIn PDF document text
    • https://xigmatek.com/upload/files/zifotarulafi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc8eea83e---25935004140.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607142ac1437c---gefirafopimu.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/tolud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68202a6e0---wikusi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd121ca64---26587544121.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/13687654402.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/rebis.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rofod.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c152449a24e---40207393586.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/82487761326.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2e0a97d9c---zolorazozafuni.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1f4f3kbu3ql9u5bbm1oa341obg/dobaziwi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bfe89591---3727646552.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bbekac85eqnnsndul1vsl710fd/nivema.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/zexepafuvoju.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fd2bb4cd3dc1245122d2867d2903e857/duxuzuwijezari.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tobimupumatogorida.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078355244512---7997487869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toukiden+the+age+of+demons+psp+iso+english+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 11088 bytes
SHA-256: d44a5e35b91b26579e9056d1c14b693b04b5fbf389cb04e15f0c669cc67fb361
font_02_sfnt_off00016384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16384 19364 bytes
SHA-256: aa7f6747dbef9ede85cc2c83012c23d22b9c5945fe275352cd18e6522c30f181
font_03_sfnt_off0001963b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1963B 4568 bytes
SHA-256: 29624ee514087a747bb1a9138fc30691124eeb87d5b62ad5e70b04b45a3b2e0e
font_04_sfnt_off0001a731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A731 16164 bytes
SHA-256: a29b536ab701e0f3a4d03943dd56dd4ec8b8c0d8b29b8e28b2448b9bd76a7e77