Malicious PDF — malware analysis report

Static analysis result for SHA-256 920c79247611f00d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 03:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29cc510d8678bd700bde791e2b1b95ca SHA-1: 5aec513b492623fa5962d03658b322d63d166772 SHA-256: 920c79247611f00dc8549cd2e13703c12c91499f44d20509646d72f983e22d47
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://phuquiland.com/upload/files/tekalakinefizulefubivul.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/14285059de03902fc690532883dfdb64/81934811934.pdfIn PDF document text
    • https://limsurdua.com/contents/files/23906735090.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/19488591269.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/golutanebibusatup.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/wosibumodoresonew.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/21455349920.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21614461011.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091008123910.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/dofubovunewi.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/piwuwoto.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/25287228989.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/29059521148.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wowirijikin.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/75946210268.pdfIn PDF document text
    • https://cargobull.cz/res/file/93779471660.pdfIn PDF document text
    • http://rs-entp.com/upload/file/19682040163.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3f11d588---13553687071.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/34549816600.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/63618097030.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zefamafiminevowibek.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/leduvamep.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/81673294844.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a93d3ebae---fupexikesedele.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/natajiwezosenukax.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/matera.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/saneriwitulazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+take+my+android+phone+off+of+safe+modePDF 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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 17832 bytes
SHA-256: d5bc86dccf3cf2dae7ee72ce275adc30277ad489b61e7d5921ffdeb26300e701
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 11000 bytes
SHA-256: 6dc0f7e75e58fffc852d1db23d944d2071addcfe7de9f039cae829a40390e0f6

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