Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e702b945230e5d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 10:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 504f479e1c3fc13e02fc97b0407ec905 SHA-1: daf2ad9926249ced3e105854da88e72f15e1e7aa SHA-256: 44e702b945230e5d338b3859b3b8c8acc4cc6a68722c398e5b7b4e92b31fb128
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple links pointing to compromised WordPress upload storage and disposable hosting suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jogagongu.pl/userfiles/file/52782907739.pdf
    • http://zhatuogz.com/uploadfile/file/fudakumanunalezap.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613203331e64e---natopebisegonuzoveki.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc69926d10---nenimaluxowudofusuf.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/883363a95b42c5e0ac2c5f24f912d652/55464926231.pdf
    • https://contemporaryteas.in/admin/uploads/file/fedagepores.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2053e405bd0e5de0aee8416fae84a33b/93139069654.pdf
    • http://lahma.pl/_u/userfiles/file/52761241412.pdf
    • https://grupo-kayros.com/userfiles/file/53581020583.pdf
    • http://lnv-cnc.gr/userfiles/file/sovopupemajugiju.pdf
    • http://modra-skola.cz/userfiles/file/somadezariturajupenepe.pdf
    • https://piti.leaddeehub.com/userfiles/files/xiwevuboverotom.pdf
    • http://proficlim.ru/public/userfiles/file/xuvudutejedoresuzi.pdf
    • http://vinhthuan.com/upload/files/jenelejodulezeki.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa794e665---46881881121.pdf
    • http://generaltubi.com/container/ckfiles/files/ganixelexogemu.pdf
    • http://konferencii.org/web/uploads/assets/file/togim.pdf
    • http://carnow.jp/js/upload/files/bibunenikenob.pdf
    • http://www.hebrewforreadingcomprehension.com/content/32342904047.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lageoh08hbft7io0m1bieu7hdc/52358025528.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/4060261961.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/zudowaxanukopepivi.pdf
    • http://zubrcup.by/files/files/75649933156.pdf
    • http://benthanhsgfarm.com/images/uploads/files/nupabu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac4fbc698---rijunimatudarofema.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/witulakipodefajuf.pdf
    • http://karimeh.com/public/userfiles/file/lelubutubewulutebotavix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+off+safe+mode+on+my+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc41.bin
942a455e134acb4f00f71088aeadfd42f7e9a4db8a0dd8d0d7fd2facf31a6155
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16788 bytes
font_01_sfnt_off000107a9.bin
fb31640d5ad30131e699d826a4a27f2fcba063cefcd308df1469dd6e747f0874
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11008 bytes
font_02_sfnt_off0001211b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes