Malicious PDF — malware analysis report

Static analysis result for SHA-256 4116d7e46ea322cd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 05:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10121d214d65a37558d55fd9c78febaf SHA-1: efa5b471fada94197eff1aef6622902c8219762a SHA-256: 4116d7e46ea322cd16197dc4f8e4f935eba787b44c8ff92c8f30b553d0ae0735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests the primary attack vector is redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=mod+apk+for+minecraft PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ad0a1947---bivapijegusuwipu.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/40087449081.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/zenusafezogakinopirok.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/rotokozupedu.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lufipujigudobibarewefat.pdfIn PDF document text
    • http://cutskytools.com/d/files/75654869701.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/55727668613.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/bijus.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/boximojodigugafazutupaxi.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/ziziraz.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/25031675237.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/pelidusutekam.pdfIn PDF document text
    • http://hiniceshine.com/upload/15327588592.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/63630885828.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/dixisozofodisopedogovor.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6a19382f---biwofosasuwulupovatu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a15918d0ac1ae34d13ce56d24bf49da8/32423434402.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/suxexupevugosini.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/timer.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/tutig.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/680778db5ec63576c0a06cacd18a48b6/tasakanetejug.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/24143242096.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_off0000be44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 16160 bytes
SHA-256: 221b0253e5d517123b1ed0ae7c16566b466fa06c596988a0468f25a8ba33501c
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10652 bytes
SHA-256: b8747c98b4994f8fd917fab687c9290e2155e8e50806c7d29c99f4f56d49044a