Malicious PDF — malware analysis report

Static analysis result for SHA-256 68313e6d27ea7fa5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 22:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c32efc1fa951befb66219ca674101d0 SHA-1: dc5cffb3a2d3cdba683e83c61369b21c968175a2 SHA-256: 68313e6d27ea7fa5a4edfd3f5d410444dfa3188476253ad0eee672f2e3548bb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=naked+browser+apk PDF link annotation
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0966810001632307753.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/34569804048.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xevisixaw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f22dc8a6a---golitipomefepixiwosonad.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9fead6be---pibazudibusidezuperade.pdfIn PDF document text
    • http://napiarsaigh.com/images/42456841717.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xujolozadosovule.pdfIn PDF document text
    • http://bienbao.org/uploads/files/23058213449.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55707458372.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/90972336512.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/rerofujodapobuwogilup.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/82392196832.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a4ed8611---69389645355.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/57094596871.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bffb1df84---28333994202.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/10526833532.pdfIn PDF document text
    • https://thehouseproduction.net/file/26494253004.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/7324686593.pdfIn PDF document text
    • http://archbot.pl/files/file/38421298686.pdfIn PDF document text
    • http://tradotel-riviera.com/file/23377736262.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/xoseso.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/63323619392.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/gewajebufelugak.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/nipaxivixesa.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/28696425929.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_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 10340 bytes
SHA-256: 8c558e54b761c4aaad55b483615a6e3081e4e2ff14ed4c908106dee4acc3f0b4
font_01_sfnt_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 15660 bytes
SHA-256: 7f85bff3656d0bf41c92b4888a7a862b7f932f6e078024e955b014261d66d2d9

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