Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc385797d63e1653…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 06:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24dd46ea635ee9af9728283cc115d911 SHA-1: 51c4919d346e0f612d85c2476e73b1134a0141d1 SHA-256: dc385797d63e1653c9545304a38435223847e2d1cb8ca5c92658fbe68689a959
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=file+hiding+app+android PDF link annotation
    • http://kennycojewelry.com/userfiles/files/202109/1630493483.pdfIn PDF document text
    • http://cortabellanews.com/userimages/ribemopixidifawifetowi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613377dcb3c59---35943187763.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/fuvejusi.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/35153100880.pdfIn PDF document text
    • http://balalajka.nu/media/vopif.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vufupijolelikij.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/dujogejolebid.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90e3ce59a---39769882443.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/10896418634.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/sopobasejuwemabivejin.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415508d2154---vibamipalezuvipelepa.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/30531842652.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dotavejanawuk.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614001ca30fb8---67923253422.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/pavakixabul.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/70869830155.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb3824537---tetezaratunopurekonaguv.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/ganas.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3640f3cfa---54641146209.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zizurezo.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/55867798149.pdfIn PDF document text
    • https://paperland.bg/uploads/file/suxara.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gimik.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/fises.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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 14824 bytes
SHA-256: 3695908528c17328e5f412e2a85b62fc824fec7710f4cb539a656a1365152a96
font_01_sfnt_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10384 bytes
SHA-256: 9c88756db72ab75898c890be24b00e81d992b6fed80a9c4ad9fa513815e6a6fa

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