Malicious PDF — malware analysis report

Static analysis result for SHA-256 357692c79b596673…

MALICIOUS

PDF

189.6 KB Created: 2021-06-18 04:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5f21798c255bc64b37a9a64a8564545a SHA-1: 5edd1222e0da6cae10a13cf6125419fd34d9248e SHA-256: 357692c79b596673959ee12b1b361256c4b5d170c6a3ab8fed792948ad8e4ea7
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=ccna+basics+pdf+notes PDF link annotation
    • https://coil.hk/upload/files/fasosozagivifobevuwusifuf.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5e4dd943a2d91ae5781490773b1f5da6/16033567223.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/27146915375.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/sisibakoriv.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q598tk037i5kjkqg5mk746lu6o/lafizosupedewe.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4ddebde1a8f2712459f0b75553c6808c/84219460293.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/is7b4s92t0rmml6783ar2b1qth/95758243372.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fvfop7a7gt76dmos80k2jace0o/xubopilawifubipapapu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609426fe98cb9---malavifunazibuwane.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809823d9f3b---banovonife.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5kvsvvp5dtvqrfron08lsc5i4/kesiwukafuwavuderese.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/4322916101.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922d087488c---5300665956.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/bb50i6oq3gq5c339bu7k4uqpf9/79310148621.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file/%5C/2021052914251751.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e4b2e6bff54ca39507fa55f0ab41aca8/kewetubexuzefenawazutaj.pdfIn PDF document text
    • https://mycomputernotes.com��In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off00029cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CF2 4972 bytes
SHA-256: 311c4b4433591ccb6cd80994cd2252aab876788d1a462bb6bde854710c36279f
font_01_sfnt_off0002adda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADDA 12608 bytes
SHA-256: b75bf2787c4b6d748a8c7dba1b09fb6f1ae824ac0b71956df4a10f253c542339
font_02_sfnt_off0002d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D8AF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e