Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d3a7412c8d9550…

MALICIOUS

PDF

96.5 KB Created: 2021-06-30 12:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c263cb6fd306ce1cd7a9dbd7a8ba17a3 SHA-1: aae394c6cd3da68377c6df7171d87a564c2fd2b1 SHA-256: b6d3a7412c8d95509165c576e8ec6410f02de42ef9876c5d12242f90bec7254c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.deopendeur.org/imgUser/file/19275036056.pdf
    • http://bafiti.com/sklep/userfiles/file/32101812641.pdf
    • http://tlproduct.com/userfiles/file/vubifotatexovi.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/15653327991.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/8957313011.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/31dc3c9a61eb554c3f448e8d43494188/gagebopot.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec27437fe---sosokiderumepakezureru.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802d72ad7d---nuboviba.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8fcdfeb7---sonisiwokawofinila.pdf
    • https://appvid.eus/userfiles/files/80594752827.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7dbd812e---toruxab.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88e05178f---ruramokezuvurane.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160744a6e4ecda---rawozediboguvanubal.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f06532fc---kegoxefugesilimi.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/texetesezimuxowavem.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c047c0ef9a---posagaduj.pdf
    • http://thesecurityguardunion.ca/userfiles/files/kukejetu.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/o5k3alsmeuji2cn398tccr0emr/41541732314.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/mh1u787eve198315s7bqvqvqcq/53595876433.pdf
    • https://autoroman-service.ro/imagini_ws/gewokatujova.pdf
    • http://hainescentreasia.com/images/file/tumapilefagir.pdf
    • https://sasalidayanisma.org/uploads/file/96027613614.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/388dacb4bce9220461558496bf0f2b40/rupitatawisubodadeniraren.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b5a5c692fccf7ec1dd7e96dd41734056/67115108483.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=spring+boot+annotations+list+with+explanation+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb2.bin
8489d4ef70cf1cebcfa5c5be4ceaea3bfdd7be37d47b96706ba9a6bcbfc2b78b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 18108 bytes
font_01_sfnt_off00012b9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 16792 bytes
font_02_sfnt_off000143b0.bin
5048067a5bae2b2c3bfee1d093ea6883225029101af7351173ca589a16d58e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B0 16480 bytes
font_03_sfnt_off00015a3b.bin
53dc5d416553a35de3c057c2e5391d8d0ad55123a53bf10be07636c39288b52c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3B 11180 bytes