Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df1138226e2190b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 23:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ddac6ab9252561f76cc774e60f6ab53 SHA-1: 3913418d2926e83235bed7066af0e30019e4430f SHA-256: 2df1138226e2190b08c4528324e50c94dcbda143fa5d35d3dd221d33c56b860e
156 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 WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sambometal.com/dataroom/file/xewufegixukopodamo.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba21d558c2---rodojijopovexu.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zokadilezixarutezanef.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f09645a9908ae50e3d168a5d8294edd7/69823987010.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/90440702706.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c28865ddb---17799313997.pdfIn PDF document text
    • http://trevorhannant.com/89353041412.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/92774238825.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/51730171484.pdfIn PDF document text
    • http://mosjob.ru/images/file/movigozubagukev.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a2ae29c5---7625806819.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/mukoziwagaxediwoneve.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/27512704491.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/gazipinuwonujipo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210708014425.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610abdfb8df8c---96697353468.pdfIn PDF document text
    • https://abeess.com/userfiles/file/787306109.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089c0aaeea9---zapinegufeduxu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kimovof.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39a244763---23608778633.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062304424387.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/444f8fb7289683b7cddd9991e2f6ae46/kotitum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=carrier+vector+1850+mt+manualPDF 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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 10936 bytes
SHA-256: 323bcef0e5a198b16f03a40d749f1defc990c6b990c07441b8938d944a18928a
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 17600 bytes
SHA-256: 83b4470c3dadefb14494c720f9d78747b1aab6fc1655f9d3ce02144751de27ce
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1