Malicious PDF — malware analysis report

Static analysis result for SHA-256 299b048eda1a9c76…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 06:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: da4402832a02209a8128834a2e887be8 SHA-1: 6049b823308d27543fa8dd28555c14c49b9aeb11 SHA-256: 299b048eda1a9c767fbd67490a0ea6da2936d53c6583fdcfe46091d8c126fcd3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832574f0104---fekazopafojopivopulore.pdf In PDF document text
    • http://18554080.com/userfiles/file/walujakivuvalirigubesonu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6835bb0aa2---90573410404.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2povfjcopkk3jhir2j59dn3rcr/gufodijidisipinunumokobu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/93682643717.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/xabikurozalomifogavigop.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifexifezazukuwu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/60efe3d871ce6c5f96d69faaaf7fdcaf/31065389340.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080afda091bb---31014857077.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/zonafupegajisixozenid.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/6252566882.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fa395b68---dumug.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/wilipisirumebaf.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f901dc559---budaxopiripebibomizu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608bedd1b5178---nojuzubaluvegigux.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/manaboditefewon.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f570899669b798bd627aa1d5df4ad265/wovuwomomufeviki.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cd8c098e---85241438220.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/69839667665.pdfIn PDF document text
    • http://93564497.com/userfiles/lexujekabi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fce914137e1de8b69e16493981caa7db/73597687544.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db625720d365ed868fe1f2dae765baa1/44376531392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cloze+test+for+sbi+po+2017+pdfPDF 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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 19696 bytes
SHA-256: 42a8829e72c7385ae0e91bc37c0ecda6a67c77c104bf5b5b8136a05e41889f17
font_02_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 10800 bytes
SHA-256: c6657a7ec7c3f2612cf286df38d8b26ddb3263990c7789d73f596bd44a89f05d

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