Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c216a25c2fa431…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 18:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d154cf97d415c8beebf5f9a0ae0e2dd0 SHA-1: 255684d490c9452c24cd2ca35143f6963a42d6cf SHA-256: a2c216a25c2fa4310daa48d26737b747a3c5c1213a71d154d2d3030c0e1b4710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=shadow+fight+2+hack+version+mod PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec02ba3596---45041363513.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3920058967.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/bemidiwaxux.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/navukutovevub.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/wemakinimuwu.pdfIn PDF document text
    • https://alutat.com/data/file/30061633210.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/8628428665.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/19748984841.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/go4lplaos0lg3gqim7nct38oln/82601295639.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/gipizadokamubut.pdfIn PDF document text
    • http://citra.cl/userfiles/file/91372738350.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d086ecc8c3---nixagitobad.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5298bd3f2---guxunipob.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/vubewizepuvuzowi.pdfIn PDF document text
    • http://hexindechem.com/upload/files/85801236473.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/kikadilojozojifufakujita.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/bulejajiragozarowid.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/13077383594.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/81088430281.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/88771736694.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/90040318536.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/27613424505.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vutazedikazip.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/46756692386.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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 14752 bytes
SHA-256: bf2c7599304292157e86d3e4392ad3cbca479d1b881039b833efd44ba9836515
font_01_sfnt_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 11316 bytes
SHA-256: af9a76febb6e93056138b5a0c6f15394050239d30400efafafe5f28f1f939816
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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