Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50fa8c1f2bed7ea…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 16:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68d1f44f83f85e237d3627ae652dde04 SHA-1: 5a3fa71dccece3e9ce655fd33eb4396dfa225ad8 SHA-256: b50fa8c1f2bed7ea2f99dd0f6f998cf3fce4eb77cb8d74f2afe3aabd22a1ba1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not uncommon for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=mafia+definitive+edition+apk PDF link annotation
    • http://peak-experience-europe.com/images/blog/file/nigimufife.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/72899378345.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/27417193567.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f4b8638b---lapile.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fugirove.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/giwazobizaturanurex.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/dapuvixurizewuriw.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/manolurojuxapu.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/48291862397.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/35095127892.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/389594297.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/96706730580.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109102229043919.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/6790235989.pdfIn PDF document text
    • http://scpt.it/userfiles/files/bolawusidigif.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210914_092506.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/libotop.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/lirikizagu.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/82008235194.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c6df9ec2d987a7dca5572bfb59ab1386/2294564088.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/kafopuladedamegug.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/62827227368.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/52511357766.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffeb9b66dd---78477071683.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/59486509913.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/folikoviliruwirim.pdfIn PDF document text
    • 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_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 18224 bytes
SHA-256: a1f7202486f4afa5b690b87c936efaff03ab37768f4b418a004cecf6917cf4f4
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10328 bytes
SHA-256: 39b10db7dbf62716f81f4e8aacf172b01be5492b4aa9a838fcb492b6cb3a1860

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