Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f69cea8e3ad793a…

MALICIOUS

PDF

96.2 KB Created: 2021-09-13 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5237703f64da0368034c5b0f2b3501e6 SHA-1: 48c93a3b9f2a3b01b022139f8471b72a40860ff5 SHA-256: 6f69cea8e3ad793a964a87781aae73110046e8923dd1873bafa1d8646b330a39
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised infrastructure suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://seedcambodia.org/htdocs/cljr/data/files/muxizamuzo.pdf In PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/32130329481.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6df177f7---nududefunizukile.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/55463497991.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/zokom.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fawujobidesewajileta.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f956279df0---bibofunaxotid.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/46605388678.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/13801162990.pdfIn PDF document text
    • https://qkon.ca/images/file/84187970603.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39854337253.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakekorifanixavo.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/geranitoroxetumasuge.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/54808543433.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/47866317043.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090115540236.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/folix.pdfIn PDF document text
    • http://104408017.linker.tw/files/79217241593.pdfIn PDF document text
    • https://grnca.org/img/files/files/73408230504.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tenafakizuw.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/faxunulagumal.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910002208.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5f433da4---rejavunifuposuwumexogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ochocinco+fight+highlightsPDF 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_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 10244 bytes
SHA-256: fbe1b67b029eb24e3a5e47e3c13b7de098a0ef1ca0db1f923b21ddd97fc2ee68
font_01_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 19704 bytes
SHA-256: 9f46202926cc51dc9a5b5b6ea23754f330a299274ebbaef4ce6870465292653e
font_02_sfnt_off00015ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1