Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0c5100c9e4099c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 16:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4126ed34bab4418ea4b132e3b88f4e7 SHA-1: edca72df4460b3b78dc0f6c218de9081813a29a1 SHA-256: da0c5100c9e4099c7830b1d432d74029865b992f1dcf3b896cd28703578809cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream, which is a common technique for executing malicious code. Multiple heuristics indicate the PDF acts as a link farm, directing users to various compromised websites and potentially disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to phish for credentials or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=justdial+apk+download PDF link annotation
    • http://tiga.co.th/ckfinder/userfiles/files/86868238740.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/88160797260.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f12c798b8b44e2ee5085f7a253e4ce97/korofazidonikidewafifadol.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/lepulimiwuviresuj1631323121.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/44254256478.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/ranab.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/65411234299.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16145d259de3b1---gapisopezefagokigexubelaf.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/35758552725.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109011405287067.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/vikika.pdfIn PDF document text
    • http://juentai.com/userfiles/files/19058464709.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/21179629711.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/md2bp4blu02as12b21pq25kos4/98692302761.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/muvunejim.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/navexid.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/67406578473.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/6228192734.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/98724795628.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/lajuzotukase.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/67821271423.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/gitusij.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/kaxonetegugexejeme.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/166636578.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 17156 bytes
SHA-256: 076746b90dac1748492272a199143f6fb10dd24840cf00047bcc6790958034f4
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10420 bytes
SHA-256: 05297bcd94269aa4cc2acc23576e1cb3cf7d4e42a92bfbaa1a19b8b70c5cad08

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