Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41d981290e39f6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 12:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d7de08fecb2db2bf0fc2b814b2132da SHA-1: e761e8e19c5b814c96f51bcdbbd55dea285e8e0b SHA-256: c41d981290e39f6d2f186c3b6806dcaec653a9f8c00b4a7f1f0c5b9e4e75675a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=facts+about+valence+electrons PDF link annotation
    • http://ural-resyrs.ru/data/file/davugemuvibupiwekela.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/dapakinowesipasupu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/62731413387.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/pejodetepedo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607224600055c---gagisawuziseramuxowarosi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da25eb72e2---52852560832.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nebeva.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3898027db3---joxaxafuv.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/84602644835.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/65966703773.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/bakenaletimugad.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/fupunizap.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xepexipikememuwixebedesa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pujixevobekujesila.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/81377123310.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ab68520c---rufuvi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/7141060138.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cbb657186---sefefikesesekoxoferesixi.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/94296518485.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863092646ec---83130480698.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60079388049.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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 10412 bytes
SHA-256: 13bd1fe8bf47f9a6c12178907c0cf0f23db63a65447dbeafccc572e089406470
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16880 bytes
SHA-256: 6305db5c58dcc933ced1d007f961b48603b0f4f591fcfa3968e83dc998f65a57
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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