Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7734018032eab1…

MALICIOUS

PDF

77.4 KB Created: 2021-10-10 18:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3296bf2d99f3ec974ec9a76fa20fef3 SHA-1: 5de91c1523968a014886cee02599906e8f937f2c SHA-256: fe7734018032eab194ef56330565c869e1ed1c4bbd52add0a92859259fa93301
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://slavyansk.biz/userfiles/file/60558663269.pdf In PDF document text
    • https://hoanghaie.com/Images_upload/files/mawiduw.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/52628400126.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/47916371950.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a70fdcedc8---10773830078.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/79641671384.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/diniwa.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lesisibojelazazijuja.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/ronejefobafesanaxebupa.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/97463697239.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/243457fbde68562f6f2a50550ed3e6a2/63795140370.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/87638728227.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/bukuwuzezekaxunudikufunow.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/94048512746.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/29706419504.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/544754654.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/8244794439.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/litodenava.pdfIn PDF document text
    • http://kbchina.de/upload/rikewito.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/82214349862.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/97204287654.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/529fd7ad679929c2796649e1b73c6b21/36713152869.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092513471997.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614adfeb66cb5---73048724180.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/37715385866.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/ruxefefewukisusuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=subway+surfers+coin+and+key+generatorPDF 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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 11212 bytes
SHA-256: cfdc3b017479a41775fba9aa06f9cbacb0770b10987861e32d2d658de4c2a2b5
font_02_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 17724 bytes
SHA-256: a342a0d3ca4f08126bf73fdd28ecd10bc054332bb9756920c847315a631b3e63

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