Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42aea898239b7ec…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 01:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9963a258a02bbc4849dbab56ec9c4cd7 SHA-1: 88edc31db5658096a6386b1cbe6f689128e4b073 SHA-256: b42aea898239b7ecb72228d79035f4fd7808a7721b8a71c8e8a928e91e4a2f1b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites and disposable hosting, likely to download a secondary payload. The presence of invoice and download button lures suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/c9pk82kjisndc3ch04lgna7ic6/65347231771.pdf In PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/301059103211.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pogin.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160902513e7664---11347936088.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gomazalijap.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9db08f5a0a23cd76af9732e8ed2e5b59/19362016302.pdfIn PDF document text
    • https://datawire.gr/files/files/57480714243.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e09971b0bbe7d9937fb9b6cabe626674/lalikegogiferinesiwefeso.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v041cn97ls2ii6foifq8l3ned/luzituxobamuxeriguma.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/87328048997.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/37576865973.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/81857739169.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607979899ffb5---3620273307.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23210534656.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b44ea7b4---jadewinixikovub.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/316a53fd3cee53c8f8f5f040e05f7fcc/60525514506.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/94951856081.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lanrgsl18d0u3cvba31o754afe/varasavoweretunozu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4vkcoioedbmpjcetmnf63u9i16/nawitunomuguzan.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/69cb41772b5e11306b468456852a4ac1/bubidusisugibaxafusu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6179c21a1cce22ed25e9cf926cf47871/81062667503.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210630041654.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347b60097d---nuduso.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f18596e7f---59169062985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=salvar+o+curriculo+lattes+em+pdfPDF 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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10920 bytes
SHA-256: 8638fa39b6dccb06462442a7fc35bd55c80ca480c1f7b5dbd64ac05097a1c87d
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 19516 bytes
SHA-256: 2b25b74ef9966484daf35343f80eb7e2e287a8ab99258f5e5a99dc5f9003bbfd

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