Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe3c1b5836f4351…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 15:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90b055b43a082afce3a7783a6cbabeb2 SHA-1: 63537bc5dceefb95b13d8f14e38648efc1f2f370 SHA-256: fbe3c1b5836f4351d2ffafb1980e052853921cf4452bf2bf6a876a5c6fe70dbc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristic firings point towards a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ltssinternational.com/res/wysiwyg/file/lozotulugumofox.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1fntrr1q1mcdf0f14tdvci1dmq/12128154530.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/30025744154.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/kaburubaxokutola.pdfIn PDF document text
    • http://agavietnam.com/img/files/sivimusumarelolopizexemul.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/babakoganogipakuji.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/77859916887.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/wofamez.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/moruvarijidolunolosidu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141677ef290f---dibefejamimumiwipe.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xiwapunuberedep.pdfIn PDF document text
    • http://atrsara.ir/resource/files/76242076789.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gidujebomobepowarofi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/vasulomupujitowobevinaruf.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/41574601842.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/97700624191.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fgt0eoe09bloq4tq99mtfsll23/52054717950.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/9715791612.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/newegamixukizu.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/lanulibukavuramozo.pdfIn PDF document text
    • http://93564497.com/userfiles/tarodoken.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/84881392329.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8881b5484---mezex.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/67227700102.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23324800922.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r6v4n5r1a84nq6mlljb6u2lt36/19814906937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+dragon+ball+legendsPDF 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_off0000c3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B3 10460 bytes
SHA-256: ebc22e25be6371cc39ec9d108187c95a20fe9b409a00930af166ee22ec4f2fae
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 16864 bytes
SHA-256: 52cfcbfa21ca0aa627ef56542ea19abf7f1f96b6939b6c27b22addb30aee5da8
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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