Malicious PDF — malware analysis report

Static analysis result for SHA-256 4857ffb9f9b63a30…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 06:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91b3f17d4ee61c39f9b0703275bf2c8a SHA-1: 48d98342262a0274abb9181a7ae0577a8466d5e2 SHA-256: 4857ffb9f9b63a3053a3731077187464aee2c36770146992cb25afb068b9ef11
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of a URL with 'utm_term=cleanmymac+x+activation+code' indicates a lure for potentially pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=cleanmymac+x+activation+code PDF link annotation
    • http://bindashnews.com/userfiles/file/tupibo.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jipilefazakisotu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/selodifewoso.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/zevolizamixavas.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93787523867.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/voxanemofol.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dipugesux.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q4c0j1m754csgjf35eu0520b2s/30674250986.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/dewonojar.pdfIn PDF document text
    • http://saaretravel.ee/images/file/wigijexudelefegub.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/38193095736.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b0a7a229---16367809523.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c26e6ca2---jekuz.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/92863538098.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vowinurajaw.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/ravunafutow.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/46396820135.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/63888710889.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/3580508988.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faninosefezi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/761096b2f6324f599a32de4f52c2c019/jexazu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jilenevajujobix.pdfIn 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://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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10576 bytes
SHA-256: bba7254e19b75da25e82fad0edec4549c19f3b0068cc4a43543cb342a10b7973
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16760 bytes
SHA-256: 777478586605253e670f40543854e66bbb6c3e6e9329deae7913f18a3be139cb