Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f9bffeaf2b4dc2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69e49b15a4778b3b91b6254f4671f1cd SHA-1: 068c12ec25e3dd8b1c135c9398c817b049b9ed54 SHA-256: 18f9bffeaf2b4dc25e6eaf0c0fcbd3198a5b2d80c8419ab8429625b697af5c85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=pokemon+unbound+gba PDF link annotation
    • http://patriabrno.cz/userfiles/files/47499512366.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vezitajufewo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1rcoh3dhdavk4e0n9adn88fg5b/bumemun.pdfIn PDF document text
    • https://clove7.com/userfiles/file/zokebaxaf.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/vubam.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/wemezarijukepowufu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161401da0177b7---10328470226.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/88893702280.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vajelajufukefatureluvede.pdfIn PDF document text
    • https://bak.vn/upload/files/lunafuzokukuxero.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/begoniwuwivi.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/punajuvosimisutalo.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/xapuzuvejul.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62615795784.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/52211481579.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38430984100.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/c4hfjh6jgactqpfj3nsb0vdjmq/92833222274.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/ponibagigajidakimafusa.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/53589618504.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tivedafawajuwoz.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wirokutetid.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/97925233255.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210919050729.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210911/1404357172.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/48567647150.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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 17172 bytes
SHA-256: 00e81663bff309bbcbe17a7aa57831bae381ef14c1d8c11cb486b232ba5b7ea2
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10420 bytes
SHA-256: 8e744667fef1d492f9eba6cb329d40fd03357eb47d140d369ce150c26716e088
font_02_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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