Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c0b218086ecab2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 17:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8c4db318a340a6bdf8f124026f9b98d SHA-1: 5d1600f6828c9d1e1a6ee8816173b3b3e9c1ebd2 SHA-256: 47c0b218086ecab2127e658a205aea3ce596a395b3343bcc16213d7b42771998
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=macmillan+readers+elementary+level+pdf PDF link annotation
    • http://coffee33.ru/archive/file/44871091637.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fazibixomesumutarumekuto.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/48469331325.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210906160305.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/tufazubumilulidutavazaga.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/57154567301.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lizabixeperokuw.pdfIn PDF document text
    • http://alternativecarrepair.com/userfiles/file/falope.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10538968498.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136f506b3a45---90376331222.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/26588291669.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/givix.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/18050121634.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613169fdd2ee9---gatuputofenajirusemo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613028f95b8d9---kotojozere.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/98596961304.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/gunibezagapopakuwederivef.pdfIn PDF document text
    • http://scpt.it/userfiles/files/20757909337.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/74706258926.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6fe80e49---70502517619.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gavilazitef.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/gosilafaluwa.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/rejokojufotuxe.pdfIn PDF document text
    • http://domario.ru/userfiles/file/85511267588.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/35456129026.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 17216 bytes
SHA-256: 89e19512c6e07d92d241d65804f8b8eac85ae01bd453a25338073a4b1587d4f1
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 10836 bytes
SHA-256: 0507dbb56280090af14d09092d294400833abfc4ef8336e441a8484f488218d4

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