Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad22a0fd5a8e5b39…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 19:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35f1cbb7c0f1ae06e9b9c42c2a811baa SHA-1: c2d17fbdb150cf6a1a19910287aedf9f39522f0e SHA-256: ad22a0fd5a8e5b393204a193be1696ee3b16003092744e4c382954ddcf55e9fb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=blood+and+glory+immortals+mod+apk PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106ab3818b---87592524596.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/taxanijixidijan.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/570313505.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/83651419154.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/moxebifu.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/judezeja.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/97166625757.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/32877106674.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/70722952182.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdce595d8b---87539481944.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/rozolufaguwewirit.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/nobejudewuvegas.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/89267720527.pdfIn PDF document text
    • http://gibisch.info/files/files/buwawarovekekedejunuzi.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/ximixiwomabepu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7e0572e7---93794146.pdfIn PDF document text
    • http://wdnederland.nl/file/84084171534.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pokosasowuv.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/75392742269.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2741267919.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/29340383979.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/46312205271.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/67921923126.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/10149161151.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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 17868 bytes
SHA-256: cf13aede3a821d1576711197392ff7626a8b31c2015b3338442ba241d3e6b877
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10860 bytes
SHA-256: a7f85e1807a230e47598a51a929c7df7e99f87d0de5e946cad82dfc65b2c587e

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