Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddaec81c76e5904…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 05:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 425a5f894ce968db49eafbf1bf6364ae SHA-1: 629412d6f72f0acef3709cbaad9322e689a056a8 SHA-256: 8ddaec81c76e59041582a019ef1933265b87b0d0db9f060a9918350781df90b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=phone+interview+questions+and+answers+for+nurses PDF link annotation
    • http://vanhacollection.com/images/files/jipavaworuxuboweneg.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/nosexalezav.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ropemetalulevalilix.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/83555537944.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb0eb794b---jekimimet.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p953klprjkvvltdaf43nu9hut1/watovifozufewanogoxeb.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/36502680521.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210831232014.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/demerosorexivujarofeda.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2987f38ec---85495860474.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/41834425118.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/veroladufojako.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/36481145346.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/20469398391.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/17196741191.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/42321323090.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/xakuzojekofojedekux.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vupasovipekadubes.pdfIn PDF document text
    • http://symbolfoods.com/files/file///55758409896.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/98941756053.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/bemafinis.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/59310128430.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/68457183014.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/basepufavebafuzosupit.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_off0000b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2ED 10804 bytes
SHA-256: 6ca00bdf841a8b6f88fbab9f345fa6b69fd3ef9bab8c50dfc25ea60dbcfb28d0
font_01_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 14796 bytes
SHA-256: ba0267a6a66d1914a2c1410f974da556a34948028674f2e59bf33387cde9db8e
font_02_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1