Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0bdb7f02a81ee2…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fbf85f7d107dfb4326887af71275a4e SHA-1: 185c494ecf8f32a9135e5bd5d7a5a473a0cc4cac SHA-256: ad0bdb7f02a81ee2fa68773627f6d4a0c30c4571b23863dcfd508eb624ac2cfa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic for phishing or malware delivery, indicated by heuristics like PDF_IMAGE_LURE. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=free+printable+pictograph+worksheets+for+5th+grade PDF link annotation
    • https://phuketwebstudio.com/ckfinder/userfiles/files/kifubovibojafu.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/99126633723.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/rakete.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/relotujimapemagokasi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/26321195239.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/92496402193.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/38647001895.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/073b033508f3d2c3c4a1143f0d6cf793/23669705403.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/zumakixuf.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45f207317e---jesiwutemigelu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9af80ba3---belazi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16101136e54ad6---845991638.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16112293675b1e---towakeweluniveriserevom.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98182783024.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/aead320985de9cd181dcaf1023a397bf/pafexidefizekivido.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/847677aee816a0dbb2cb34e435fdcdb8/36409273742.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/26436181416.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/pofutekugiba.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/38960395697.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/dalefem.pdfIn PDF document text
    • http://dztechfin.com/upload/file///1299800765.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0782dea372---jeviliwamirikebanasaxo.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/42060459861.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/27/madisupumino.pdfIn PDF document text
    • http://dogable.de/userfiles/file/26693556508.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e58f0def0a218c59d64a5ef6608a13c8/62261043267.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-14/20210714055305697053.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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 14564 bytes
SHA-256: 2b11ea1a1764ca75efc1025ec5c3c9936b696dc8932eb0ce0946bc0c0f6acfed
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 11328 bytes
SHA-256: e8ad641079b7919a14590bb9e28be904b3ebd49de7fc9a4085b812663e0b7e57

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