Malicious PDF — malware analysis report

Static analysis result for SHA-256 878100b14c693aa5…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 14:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d70bd25eddb4c8797179d3fd73ef46ac SHA-1: 3c9aaa43380de5965e2f52d3af95f52d25993215 SHA-256: 878100b14c693aa55ed1801890e2c5cd282f9ce8aee4d43ce95a2f40b57d2cdd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=wondershare+pro+apk PDF link annotation
    • http://syntrend.critical.tw/upload/files/14187562189.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gekagobumubo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/rinufugo.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/44875588922.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/tegadok.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/kafoziz.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/36046495026.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/sapokuragukamogujover.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/81452038619.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/laruvepatupu.pdfIn PDF document text
    • http://esen.life/userfiles/file/94882898133.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/65684674314.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/29266624467.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/xaxisetopexodedu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/samesirovizuvivigomo.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71990503701.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/72eru7oeoo0iusqdi7q0em0852/funotigaweligitakedex.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/40979800947.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55dsj9u3ddelb4de5fau69em83/sakomexileropur.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/99145117477.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/24538479515.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/446e746d341ac4cfdd0bd17c99df807c/laxutafudegokomaxolod.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xavobiviba.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nujuvasanizurixaxunuxo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02fbc09e---fifopa.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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 15236 bytes
SHA-256: 0d76a833e806c43ec3ceb1f40ad9e6862d313fed097f3d63bd839f350ec0a2a2
font_01_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 10336 bytes
SHA-256: ceeebc063a027cb59c103b79ded62a7aedc7a2a99e04f3793e10ee7d952e3ba3
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1