Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da832b8e943e046…

MALICIOUS

PDF

96.8 KB Created: 2021-07-16 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e0e1bac3a898df79be5678e70a3fa40 SHA-1: b1aa6a7fa837084c81598f365b8c4755c9f932e5 SHA-256: 8da832b8e943e0464d3c7e2c90d0c047f030ecb2384840fc722a70edb5ce94a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://oniceh.ru/uplcv?utm_term=rye+whiskey+cocktails PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5b1886258a1fe2863a0d51c7e528f171/kudot.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///57282785718.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed155474f9---gadexul.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/muboxuvonigaba.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2857d2ded---98179283832.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/44920158860.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6d880a6d27c1524912143677d91ffbf3/19449831178.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f5t7e92cadul118r4qnv62m427/41586499514.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jikebexevujobolup.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/tosanetarajamuxexujigimez.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/86229653179.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/mudeseze.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/tukelasezuxabetub.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210620235836916.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/33905985114.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/zuvekijamujowa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0e3d122672b53dbc85d7e3630054104/88675342359.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/13184642625.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/94377042756.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/70146357924.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/67825550982.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/pojoga.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/89556603639.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f04c54748fd---80942189272.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_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10460 bytes
SHA-256: 6630891a15baa6e18a9f546da15cfa2b75b2e43aab8e3c20c33a7fff692d8ab1
font_01_sfnt_off00012f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 18072 bytes
SHA-256: 79812f35bab867fba87252339e43894875b8a3370733f24f76bdc5a1096c5f65
font_02_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1