Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b7d2c98c008ecf…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 06:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56c8452a13cffbc7d49f096c9907a960 SHA-1: ad946dd849eaf2f54bf8d226dd3f807fe2d3f213 SHA-256: a5b7d2c98c008ecf1669c2cd33fff858603246b51bb4169c8e3d9faaf389bb0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple unknown URLs, suggesting it's designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using compromised or disposable hosting for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jevades.com/aircraft/fckimages/file/furabafolo.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773f3986844---74718581557.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/92648099171.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kolimuwunojod.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/fasuwajisiwizono.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/95074861196.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/60668336361.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/12657785453.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc751044cdf---2851067027.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/lefixoziramumuwajuj.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/disivamejirunamafe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9fd0af2d79295289f9d5e49277f07144/kogowazimemajomupuwigejib.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/62244109316.pdfIn PDF document text
    • https://slotpt2.com/contents/files/89988776538.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/deviv.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/30026484491.pdfIn PDF document text
    • http://retailcop.ca/files/5867455222.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753f2bb7ab1---fagenegazituneme.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/61934434565.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108041048461106.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/wisejusexebalade.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108630855a96---rixaki.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/90445789548.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d842d51c41---31754398845.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/sidumalomadub.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/12141728965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=oracle+pl%2Fsql+tutorial+for+beginners+with+examples+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_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 11700 bytes
SHA-256: dbd95a4417e11f11ba6210a9efb84c68a88f8d56703893b288628ffe1be1426e
font_02_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 18668 bytes
SHA-256: 534362a265fc771555cd969f5c2b9827a2feb886ff23c236a7e3e97936e26528

Open this report in the interactive analyzer, or submit your own file for analysis.