Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e62d9088160cfc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 12:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fce50e2bc9f4a49b786b87c0faef1958 SHA-1: 0e36f36726b10a4d8af45804678f543f1f60f64d SHA-256: 57e62d9088160cfc351afc5274e2d0a6142f718cd08871798d74560daab9f653
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'free PDF to Word converter' lure, combined with the hosting on compromised CMS uploads, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 http://envisystem.com/upload/userfile/files/livavuferajeva.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/fuxefaxosetulaxanu.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210819041206.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/83677197930.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/32766724130.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/77128306937.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/77695885095.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/wigagegide.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/95017741254.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e357bd8a---66482569748.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be872d6f6d4---88929536566.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5146623fb1386150375b78c7c2b33/36994111266.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wejatomo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/93970324468.pdfIn PDF document text
    • http://irollee.com/userfiles/file/lulogufizerazurawat.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/41540941351.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f381a0c6---mabodibudeluda.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/berowuzinufalexudevelutev.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d348580f356---sakute.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/98009519255.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/790f8c47ff62df3ac43038c41c56cd3b/xitixivorolememulaza.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/jekakitamalopulaga.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7892d989d8---13726504139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+pdf+to+word+converter+nitro+cloudPDF link annotation
    • 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_off0000c946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17000 bytes
SHA-256: 7d41c647f82d605f9d5ac234af8a8679c1e8d11adfc2d000d714eef86b773cc5
font_02_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10512 bytes
SHA-256: d24660f0b2076f2a6cf9463bd299c92d00b4fe5fd239dc01b809e68e1108b71c

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