Malicious PDF — malware analysis report

Static analysis result for SHA-256 453a430da902b667…

MALICIOUS

PDF

113.1 KB Created: 2021-07-21 04:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d3d0c857d035f219573ca87fe895e5f SHA-1: 7c4d9d766e0a620e1dd319653231b8288cff56ce SHA-256: 453a430da902b667c95903fea58c64982b6f3b02f61bb9b4cf5738d39959faa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable or compromised hosting further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/65fe2e2fd63938653010fe3762cf865f/fogetabefakumeboza.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/66144096390.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/93471431584.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b534d07a9b---lituruzejupofozepo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f1f76cdba863f0bb91cf52b645eb452b/bakudisutofuxasorawog.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/xukejojekepovogoxanofiror.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077163911b99---giporewelikotugunixon.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dvrd5a1qt7vdln9u7ts5pnpl7q/40482791659.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6a88f4c1---77852242057.pdfIn PDF document text
    • https://asiahijau.com/contents//files/29304009076.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a366f83ad1ae9e1f568c7f87bfd6d5b5/pawekarujuwizupiguw.pdfIn PDF document text
    • https://loctra.net/userfiles/file/93364460405.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6f6ef29f00d23d9cff58e614a3a8757a/dusodakaxifuni.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/3d942f83327a7d7793a0a40346db9d24/xusejusag.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/55782881430.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6dbc3121f54965645e89c0a5c5f477ed/88227300371.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e070b913e---vadejilezigi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807db464bcf---kinekinoxuvokexiwawudo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pejapewodipo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc699801f1---dikikegogupeka.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/puwevodozeg.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/lidovideligitoju.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/82103787890.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/52202789892.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/sopekus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=christmas+song+picture+game+answersPDF 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_off000157b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B9 10992 bytes
SHA-256: 77110424cc8f8a8fdb1c9421c02bab1f9afc614e0da041c781746e9da86aea77
font_01_sfnt_off00017132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17132 17460 bytes
SHA-256: ff70b014d9afa7b870ce7f295ef764981c5fb273ce7ccb83311256c16a8f5e0a
font_02_sfnt_off00019ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1