Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e6dd3b85376b01…

MALICIOUS

PDF

71.5 KB Created: 2021-06-18 02:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2d0a37c85f30e298968b062433608d7f SHA-1: 539caf19368abd8b28831a5e5b0d3ceea2138bb7 SHA-256: 53e6dd3b85376b011316cd4c7e0920fe5255768e8f14b6262b26fc90d4fc2047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=ed+sheeran+shape+of+you+mp3+download PDF link annotation
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kapumewojalimidu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ke6avn8g6f9nn97gs5pukho7j0/winasamiv.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7b187d90f63718e3309e21c9075f9a59/ketatitikenaveveguvumovir.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4494f03bd---figorekovolekodes.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/68884507845.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58612cbab9c7b7302afc6e8a4fd45598/66709423248.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/23f32d832dc4ed5880049706a6e8d09c/98130182091.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eb0851a20---71349064761.pdfIn PDF document text
    • http://debden.org/userfiles/file/weligibolazatez.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jusinibitonodipivof.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/adf1f282a01ab6a6776278618de37df3/27201482624.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9inrr54loft8rincede5t5tb73/nagepo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gusiwewevafoduwagebidute.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dj88rgeukfk054ubfon88v0kj7/kokixerifoligiluxi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005be13c46---rewozasulajegufojibe.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111aa9a53f---makoputonejutazi.pdfIn PDF document text
    • http://isgsrl.it/images/file/72023200598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 5596 bytes
SHA-256: 407a9f10327886e1a6721e69b165904f7ed1122ec1a6834d8ae48f1eb7fe5181
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 17040 bytes
SHA-256: 5824aa3d0353edf2662081440d8669af329500395030f60841675279a6b7025d