Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871e55afeee98af…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 18:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1cd804b3c249ad9e05a4869bf2d93ace SHA-1: 8235b258fd7ac9a384e0d1728a59ddc68485f652 SHA-256: 0871e55afeee98af6984f926cc4770801e7e7cc8f9e58967149eefd0f8fd49ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=miui+update+for+note+7+pro PDF link annotation
    • https://tavcam.com/upload/ckfinder/files/34455838239.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613319d8796ea---tenipugop.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/motoxafarixuvuramezoxub.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/jepetusemur.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mudetixalamomoro.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2b4105f19e8806d202d0d9ffe5f4eb7b/vefewudod.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/54565679235.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130969907e75---tawoduwoxedaxalajilob.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/92766449679.pdfIn PDF document text
    • https://hgb.se/filer/file/13242318949.pdfIn PDF document text
    • http://leton.pl/userfiles/file/49375973284.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/pazelolo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/josexeguvigufikikotatola.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/morujar.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109040728016798.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/navililuzogebefipidaf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713997db9e---kepebuvigutevonijabe.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/63286414057.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/rafurekexisumedu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/74901236293.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xonetaturovewero.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 21720 bytes
SHA-256: d9a499f4bef7c2dd1218b58179ff021713c277236421f8462a3b8cf5fd25d6a8
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10420 bytes
SHA-256: 1c37c8863c31495c5301ac0ac0bba65fe7e327f717751edeabc764e164f564d8

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