Malicious PDF — malware analysis report

Static analysis result for SHA-256 3160094c3d358a0e…

MALICIOUS

PDF

80.5 KB Created: 2021-10-12 08:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de40c7fa48ecfacc28342dd3154c8316 SHA-1: e998c7528e6820905328bef6f86fdae3a230ef2f SHA-256: 3160094c3d358a0e4385fb22a7dabc65ebeb4c2f24dcc1852033f154a9af3274
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oniceh.ru/uplcv?utm_term=what+is+moral+issue PDF link annotation
    • http://cloverdiamond.com/file/63975506521.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/94403308538.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/kumurovat.pdfIn PDF document text
    • http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/kukomugemusafigiwudazaro.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/39109281508.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/tugapunumo.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/7935611391.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/pewuxakodiwerok.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/68259696725.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/48874160760.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/36578544600.pdfIn PDF document text
    • http://hongdacable.com/d/files/86669624961.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/14278304208.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614628bab154c---makef.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/93697812098.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99447388592.pdfIn PDF document text
    • http://nut-shell.net/upload/files/supup.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/dotir.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_5C85EB57EBB2B1EC.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2e98feb7da2f92a98885dcd150b43d0/nazojolo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ec8d0a2a6726221ec022f29768cfad8b/xupofadakodusovofu.pdfIn PDF document text
    • https://majubesar.info/contents/files/nifedekikizijafubasava.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/siwur.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/ropajidifefijisizesudovi.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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10364 bytes
SHA-256: 4798c7ac6ba057a6f7301ddc0c2c5402989f851d65422d9e4f62b87783cf746b
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 17960 bytes
SHA-256: e8bd57c8cd7652d6cbc32f534dc12f3c21935e0ee32d0b1d29182ff0c448d6ac
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1