Malicious PDF — malware analysis report

Static analysis result for SHA-256 4117088d97283f0c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9e6329a3f4cb7cf9f5e64523fc5c8ed0 SHA-1: b9d935796ef1e956e11bb7256da2b5e1323e8b30 SHA-256: 4117088d97283f0cfac3bb89198d121404db063ef4b33febdaa12ad540b9c151
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to disposable or compromised hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://protraderin.com/userfiles/file/97711870729.pdf In PDF document text
    • https://brtim.com/uploads/wysiwyg/files/44006133157.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/jabolefupanabilavub.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27126643696.pdfIn PDF document text
    • http://edallyshop.com/upload/files/jetitiw.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/56928755241.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130592b21024---16486948276.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/mixabape.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dipurisipelobifirumos.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rooarmj3vt7grjmmmvecuc74q5/larokozofile.pdfIn PDF document text
    • http://samtekelektrik.com/files/70305524375.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b1d50c19d9e453791275cd4741e22bf3/kimitatexapozulotudezugi.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/35967781134.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/89706014800.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/52537065542.pdfIn PDF document text
    • http://headrepublic.pl/images/files/45676461205.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c513e795c3098d6e87898d8a0b207863/toxuvisovujavovitusini.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/naxeloxowirusafafaso.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c5c83b9bdab47f6d0bb16e21a76b5409/6155815983.pdfIn PDF document text
    • https://quizai.com/uploads/files/jafixiz.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/8086205715.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/1653803562.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ad5143b5c0fc1a9b50af6df258a60d46/buzolix.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/rokaveborok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+temple+run+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://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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 10596 bytes
SHA-256: f6dbb035a384c4567a211722e340f5dd522e0645eeaf2ad06fd6dfb597f7db0e
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17312 bytes
SHA-256: e65bd0b92d7591c5d884ad399cf6ac6eed6459b694f8b81144ef64c6405c154b
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1