Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c93eb491f6a2ed…

MALICIOUS

PDF

84.6 KB Created: 2021-08-25 16:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0945e2bb10d2b092cd8f2f5241de0c35 SHA-1: 538b6fea2fe9df47803d382793bb5fa8e8dd6549 SHA-256: 74c93eb491f6a2ed37b82c94a1e4bb73775977f74a8b81ed219d05f97b2dea51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://vrindaindia.com/php/joseph/uploads/file/jabenalotarorewidotiv.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/78997563623.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0r3vkh82dpivh0j25cp7go9tal/jesasevetaniboze.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/mujowufoxofut.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/183gntmepo35s4sho6vhe3euhc/42100126962.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5f0c4f6f7e3a98a7fbae1bd8d48c7a99/biwififu.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210609111120.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/82996963805.pdfIn PDF document text
    • http://cpils.com/userfiles/file/82509243993.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/99583724495.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f39c4d6ea---62519219500.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/21421626496.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/htp45d6q9ee5tv62qogk2m8l72/relunevelasonatuf.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608192c6aaf02---36702715189.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2f86ccd98d9513fcabfaa5a48d883256/suwoxuruguxalenojefibirud.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/vugakuku.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/fuxizepotarut.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6433304ad---61392359770.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/fetidina.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/tutafevumevobudigunope.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/76871839018.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8fa49990---molidojisidizukazobirin.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/fovupujabexuvulerudexe.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/tujep.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/6696301722.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/32366069346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+dictionary+of+idioms+and+phrases+free+download+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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 17664 bytes
SHA-256: 3dc95ba3da61433f946f63a2e33ad6ff3cf3d9ffc05fd0cb67f4642dbcb340e7
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 11212 bytes
SHA-256: 4b9a4b6b73946d02473ab7f383f7beb1771021215235cec67462a46d57fec12a
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1