Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99075cc4c451869…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 10:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5100c56ec9688cecef4dd572578dbda SHA-1: 937d778d4ce0307a079a0eef43ac31065d83e4f4 SHA-256: d99075cc4c4518690a16542d17713c3877e4c1c965cb28d8023312556e2f6adb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://skywaynepal.com/userfiles/file/sazifovoxirevitagejixep.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa8c5f57a---zujegulowubudagixezojeve.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6703b668fbdb05bdf2995680bca661d1/39914868583.pdfIn PDF document text
    • http://quangcaobienbang.vn/upload/fck/file/96547070024.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffa132b9c---jokovebededemanob.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e0834d19b---kuguxiropemutebo.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/31169300008.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec34682433---paxonevatavosone.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcqpkasrbq9unb9ce5uhhv9lks/4990888296.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0n7vh489n7m1eh3gbeui4vom23/fazedade.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/59807342959.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/537aaf73fc8f17148a46ce104177730b/20067190847.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kimazaku.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/35595338158.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/22096448e4dc45055e39c710522c24ec/kajijumelimilovama.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/xepoguketekomapagofixur.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/61t5t5f5l522ttbngpa9fipdk5/94372698597.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/531268188.pdfIn PDF document text
    • http://www.bash.cl/media/file/labusaxu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a586f7832d5---90307977316.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/87246745964.pdfIn PDF document text
    • https://qnzar.com/files/99590693647.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/tomenu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/sawarojunalegejuduzonov.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161195b9777ae6---temevepokolowuxajiw.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/wezofupaz.pdfIn PDF document text
    • https://duvanco.be/docs/files/pomebisewuvixugukasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=singer+sewing+machine+model+9410+manualPDF 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_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17876 bytes
SHA-256: eb463c56b24f1b4ca5f49b70b686120bac50df1918b76a8211a04071c07c9291
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 11400 bytes
SHA-256: 4223223ec108a2be66c0dc230a72b148e8da3161e3ff909b1ff497b64cf87212