Malicious PDF — malware analysis report

Static analysis result for SHA-256 715550ecd78e74a9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 23:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 174cc658eda41ec0550b36532927afbe SHA-1: f2f775581bbb4b5aab663ba02471a3b2a0571253 SHA-256: 715550ecd78e74a95b6afa5dc8acee8885124c7ecf5e8cb4aab3b3c356eba75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and heuristic firings align with techniques used to deliver malicious content via email attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://exteractif.fr/pictures/2/93172792805.pdf In PDF document text
    • http://analogsys.com/uploaded/file/121802732613fae2fbbff2.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/badipugu.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/71540629289.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16151df876853f---49580552914.pdfIn PDF document text
    • http://poorclarescork.ie/images/89209793014.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614cccb2a3b37---nagufe.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/4752711837.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68160892887.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pujexatowufinifonafutoli.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71d482a7c---52854693729.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/62797169884.pdfIn PDF document text
    • http://ailizia.com/userfiles/voxudimavub.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510286c43d1---15770003654.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/54867680311.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/89224151895.pdfIn PDF document text
    • http://sial.pl/galeria/file/88908138631.pdfIn PDF document text
    • http://ciskmv.com/css/file/tisafinawilugenevo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613035c79ec10---tejubejunoluboxi.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/23411962282.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/38687599622.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zavijavex.pdfIn PDF document text
    • https://scalper.ir/data/files/file/46124820989.pdfIn PDF document text
    • https://foulardfotografando.it/file/kikozimarizamep.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/46937998607.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5cf4424a---bujozigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+app+to+uninstall+system+appsPDF 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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 10580 bytes
SHA-256: 17e65922918549aab3d4e3aa8648f366fd0552245c531852dc94df5edcb1f9b1
font_02_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 14964 bytes
SHA-256: 056ef80cabc9776435dcf46acc94242521eb3fbe2533f467b6570cd8c2af2c14

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