Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd785a06734e1a7f…

MALICIOUS

PDF

93.2 KB Created: 2021-07-21 07:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4160d8c99041b9ecc3790222a9ca80c3 SHA-1: 28d9669bcfe64c59703baeab977ab28331fc4eac SHA-256: cd785a06734e1a7f7695e10ca6e8b9ed957463fbef619634c29a679d75c4e3de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the nature of the hosting suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://musorcentrum.hu/files/article/file/vezikelejovuwidon.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899aab8093---newibibomunelaxibosu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/suditura.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/68463745925.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qo1c8e92h20hjlruqk2u90theg/80284387254.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/82709670348.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/xipukuvubuze.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vemumojakotebezulajun.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gizanufabobutugoket.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73730bd2c7---pufavefokuzixinavafew.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e91d401733ceea03588682fd16746266/tuvovetafesoparewijirobu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf31cf5dc---30158794302.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/kuwepepirejixatanixer.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dawatejobizipe.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gubuwega.pdfIn PDF document text
    • http://derma-dts.de/files/file/kojivotivufibusiv.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/58362031952.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b9a861b0---59795231156.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/m88p1ppqmkn58jdqu7o5pnrst9/sifodumezovi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a966794bc25---tedojigowawabuzadaliw.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/lhuasu9vrtnoq99qs5ncjrkkr0/88866822469.pdfIn PDF document text
    • http://fygl.net/uploads/file/271601302867.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/482e322886084bf1fa493ca1a77f459f/dagemetanitafudefok.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7qa4uhq2e9luhgb3f79in83sb5/gusilozamexiterulon.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dcq9igpun76m6ev306tjimp4i1/somaguxurupubegupovitero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=technical+devices+in+poetryPDF 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_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16924 bytes
SHA-256: f9575d3dd2e18e8dc0fe01ee643aafbe9182daadca6aaf18e3870815f98b05f6
font_01_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC8 10756 bytes
SHA-256: ed7e3540cac6c1ee90d20c6e914dd99188d7980f35b856d973538b857ad05825