Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f0e3854666d7e1…

MALICIOUS

PDF

85.8 KB Created: 2021-10-16 02:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 048517224ea0144870521aad61bb36b2 SHA-1: 1fd67aaac3ff79b66fff11d442eb669099796d6b SHA-256: 33f0e3854666d7e145d43e0b26e5dcdd7b7decc71f16d9279cfada39c641263a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'download button' lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0776359a5---rakisevosokerurituda.pdf In PDF document text
    • http://schokofontaene.de/idata/2294481528.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/69593913685.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/musibegugilalekezibatu.pdfIn PDF document text
    • https://gcs.kz/data/content/file/tumizagunomakepibezomenem.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e11f14b4d5---levusamuwi.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/67118297510.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/pawupam.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/17868441295.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/43547627483.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/vulodilewesujumodavati.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vonezosuwugudawujiniguf.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/rozatirup.pdfIn PDF document text
    • http://gro-felix.si/uploads/pulisedetofidodovumosug.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/migenil.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/76283784296.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/juxoweru.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/88307371114.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/77870002139.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/49844199531.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83a364293---xibisomeparakawilo.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/nekusujaxesotuz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=split+pdf+into+individual+pages+online+freePDF 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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 18808 bytes
SHA-256: c4fb94aa67f5bac3351b03a0bbf17f949713a50d3387345c46547b59f364cc1c
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 10916 bytes
SHA-256: 96c0088ca06f87c3f72e3a4de95e4641bbe2d1885b42d2fd2ea563faf4a26a5f

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