Malicious PDF — malware analysis report

Static analysis result for SHA-256 de30f4f26afb18bb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 16:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e020e8eaad02cf371a44da7e7be9394f SHA-1: 196e24f28c25f2f34bafb6e541066c8b0996e343 SHA-256: de30f4f26afb18bb4f6ee90a98066dc62e4abe1b454222cab4837593e48080f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term=android+storage+cleaner' suggests a lure to trick users into downloading potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=android+storage+cleaner PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5c35b257---mefiwodesizidipavatuna.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/muviranoreriwakezeva.pdfIn PDF document text
    • https://motecx.com/images/file/sizufimulufer.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/24140215455.pdfIn PDF document text
    • https://redac.ch/upload/wiroxavuwegox.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ee8c7265---22478486006.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630bf57716---58793630241.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/bitolumazupupavap.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/36572929145.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/32163083877.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/gelemiwux.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/topudupidusimigepemeruw.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/51770653296.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/jofubowulumuwaxibi.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/38191339634.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/zunoxu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/33690483999.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/91330094376.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/tapuxawili.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/84054478028.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/varagolub.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/sivojipobegalaxurixonivo.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_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 18232 bytes
SHA-256: e11df46efab60b3b4d9e78ddd62c28cdaeaa0c937c8bfbc2948f032e8dba1b27
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10524 bytes
SHA-256: d82dc26dbbe23ece4db46488aa4370b49c9d1ce2f244a64ba36a4843e37e1c6c

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