Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b3b67ef58fbaf1…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 13:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 038bf627fe34ee99e5143910f0aac48f SHA-1: 80509cbc55c57115161dd4382d0d990944e0b9c4 SHA-256: 27b3b67ef58fbaf1500fd1e0a6f269c74a18d0102be3b934854c24a0a10db245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://gocreate.termall.pl/upload/fck/file/46550565555.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbb2be759---37523623082.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7c5ac52---saxukawoseduka.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/saloganibaji.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc75b11998---labobejozebubowigekavoki.pdfIn PDF document text
    • https://sanidom.pl/img/file/dizuxalu.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/mufefunoraza.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/86234430671.pdfIn PDF document text
    • http://gewald.ru/content/Files/wolevimadija.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kisivutilipuzoveba.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofifitutonalirovizevaj.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/50816929777.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c5cdf4d05ffbaacccc6febee3021e41/xarigufiwuwemukewimadox.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1f8dbf94---80496030154.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zoxitimuzofoxonewizal.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/48891021321.pdfIn PDF document text
    • http://talentpetroleum.com/userfiles/file/90740675586.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160befb6bbc759---lufidepoxagiju.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f4a1eb0a---xugiwamatuxu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/74252217797.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmj161gge4c9ijuovcf0vli9g2/lutuj.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vesugonuk.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/tunorag.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/putasowepidifolugokagek.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/35138057271.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nenovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=frankfurt+train+station+map+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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 18916 bytes
SHA-256: a5903c2954094d288256bfa3b2ed1bb44e0c550772e40f11005ec43b0ee9944a
font_01_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 10652 bytes
SHA-256: 15915f0c46e8ff68b1ac943aff01ca6b37e4e660526470d8dcc595f1c567e4ed
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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