Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c128a76e44f639…

MALICIOUS

PDF

83.0 KB Created: 2021-06-18 23:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8cda67a72ff0211d69d7746979f27e70 SHA-1: 22e03ef9f7ec56f2df3b33086273fd11b3fc853b SHA-256: 49c128a76e44f639ebae08b79ec8906eb0070cae0c1aa4fcf8c376963939798a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains heuristics indicating it is a link farm and uses a password-protected archive lure, suggesting it's designed to trick users into downloading a payload. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads, further indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://echipamente-scule.ro/userfiles/file/80446073519.pdf In PDF document text
    • http://www.toptehnik.si/images/85199043347.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fuvosezil.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/af1797c87cdfdaa12e20e3d49e92c8f4/wumuvulip.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4abb77fe---70304458561.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/74618905068.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/duxivodojavavino.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4869695acd---3720622698.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f1590aead---xidusetarexiluw.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2381d7c0d---fuwudiziwake.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5d76c0f0---nepivin.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fifivatekob.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/87143477689.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aca942ad300606a783eab083d947bf36/35683833561.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/fapixifa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ganodi.pdfIn 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
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+miracle+of+positive+thinking+pdf+free+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 5524 bytes
SHA-256: 0a0d3037371945b7881770e9978582b1eac81146853d65dff4cb680814f851a4
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 11996 bytes
SHA-256: 74852842672773351bd6b332926c0cb830c1533c493c79f8e31673ce5c31a052
font_02_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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