Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87f6976a4b9be1f…

MALICIOUS

PDF

114.8 KB Created: 2021-08-10 23:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 065af68e07ffc580d272de6d666d50c6 SHA-1: f6067d9cb6bd8e5ab5c8edff2f8a49a0b22cc6f7 SHA-256: e87f6976a4b9be1f39468b6cf986a8ac60b0dba0b7e0c19433fa3d1a171d7656
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious websites. The presence of these links and the overall detection as a phishing trojan suggest an attempt to lure users into a compromised state.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=ejercicios+de+presupuesto+base+cero+resueltos+en+excel PDF link annotation
    • http://douzonebnf.com/upload/file///gubadudokosisavikowuzoleg.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/rolafazivipuzibepit.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/74377325228.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mumupedezupetugesofad.pdfIn PDF document text
    • https://fratellifurloni.it/file/31180998151.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ccd1beaf---37121438512.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ce1uustken0er58bfohsci799g/sugilexozipekewaxozovumaf.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jebefomiloviwiridukudar.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/005bf9ef9f5a805b87851e16bcb07173/59325495046.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/68346105782.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/pewevopivof.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/1d8b5cfe44e9aa1e87f4a2cf09dadc28/14301355966.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e1b344d6e---91711939079.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738a13b4a78---74904543525.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xokiwasewojemakova.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0c9a6b2b150d0688fa145cb3bea6189b/tegivafar.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/41474313033.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f6cb9d73569e5a42fc301a58cb3132bd/wumitikitunedexebagiduwo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb85086583---37611747950.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/32b1dac8145a4b640f17916f97390d03/34458561173.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458a8d8480---15048997682.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/79663055573.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e2e7d8301e090ac7bb422a1d6ccb7ab0/buvot.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/tisedonajop.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_off00015558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15558 20084 bytes
SHA-256: 5688f06fc79081e8d681b9a5a43a9e161e312844f21020b8ab7b5d89a7164184
font_01_sfnt_off000188ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A106 10960 bytes
SHA-256: 74709c534d1302c6ae4ee6c50af5d01c259c0abc05cadeb0647c7c86e2d381c7

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