Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be19eb5dd5826be…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 12:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2767fcc0633addbf4b75d18b1260ee6 SHA-1: 2ba31613f21fa105da4da53728dad9ac076b780d SHA-256: 0be19eb5dd5826beaf519e90164e4b9db2ea1e7bbd40ad22fc4e42992b603c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded URLs, such as the one leading to a compromised WordPress upload, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thepokewave.com/uploads/files/76736075334.pdf In PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98603239870.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86127011898.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/ruvusijanepakelifakabapa.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/nqb8l9m8flrtgiqua68uhmk2a6/91633942869.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7cc19e0a350cfec4937419c61a0dd7c8/boditajuvamabadarusuxo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c8f5f38886d76631d70cf1b929d045f9/tulik.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/33391773427.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/mubez.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/lenunabavonovonipavedidun.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/buxoravofeko.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/batosurobozivamozelesolez.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/jagajemajaxotupidit.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/76469607904.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6d2bd6d22ff96f61ac7138061fdde740/1019347269.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/84926801560.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/gopivug.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/35121008567.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf1a4ae91---41480765675.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/94052592496.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasezigoniwalosugeve.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/pakipijipatozijufatume.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gekemex.pdfIn PDF document text
    • https://airxps.com/userfiles/files/80845730513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=resso+apk+download+for+pcPDF 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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10648 bytes
SHA-256: 9f58a7e3484b666e926078ad9dc29577e2f73e52baf69c81476da7aef32984d9
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 18380 bytes
SHA-256: 7ebbdd2fd98fe06383afb3558f350c2d52e6ed0e011d283a867ef47fa7827edd