Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa8a915b8b667d1…

MALICIOUS

PDF

96.4 KB Created: 2021-09-14 08:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5573e2d57c76c493bebd7c637e41ce7f SHA-1: 5ad4fac7d8c475766febb64aee1b55667e4aa791 SHA-256: dfa8a915b8b667d1b71f7264c791dcd9c6367b4824cd232b9716c88fb836d5c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://krisoc.ru/uplcv?utm_term=how+to+install+plants+vs+zombies+2+on+android PDF link annotation
    • https://walkandsmile.com/userfiles/file/pokujeresired.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41292349367.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/juzulefaxuwinoduka.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/99903767288.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/48315506040.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/lamelalaboxusumudi.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/lesiras.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b680bb62---fabemoverase.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/79979837705.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zafalu.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/75738364716.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39898060727.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210911015735.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/58268787461.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/boxipabuxow.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/82454137600.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1048f28bd---zegagubel.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/2320186087.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/novosolunobuzogiforo.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/xekugekinokesesesodosamad.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/gemaraga.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/13ef5c184b65615c09be6aef0f48b2f3/1943661389.pdfIn PDF document text
    • http://dgjst.com/upfile/file/36893703370.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130714fe26c2---57936022433.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 23432 bytes
SHA-256: 759ee5b2fe9486d8ad184d6ef5f8ed47c6a6d4113bc94d77fdc136a89bb34ae7
font_01_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 11016 bytes
SHA-256: 6686e1f995d187f70620e850d0df9fdc145e035e9da6aa9472c896f280106e9a
font_03_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 2084 bytes
SHA-256: b862109228214adc4839668d56e98ff78895c1420d60d65f6589c1bf7597fd55
font_04_sfnt_off00015bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFD 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822

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