Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8151bf1e7a55a92…

MALICIOUS

PDF

92.2 KB Created: 2021-09-16 18:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c285c354f82aa77d2f16f3916526a73f SHA-1: a9eaacd7b8496de678c7d89aecd0187cf392089f SHA-256: c8151bf1e7a55a92044624faf57ca6b9c6729c826788c9e47ae1783f794c924d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in URLs points towards a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=kendo+datepicker+year+only PDF link annotation
    • http://ominocoibaffi.it/userfiles/files/modapefaxigevoterotubetus.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/of0esa9qqjvr4vmbhmp7irbr37/gogavuwunaxita.pdfIn PDF document text
    • http://sinostandards.net/upload/files/gugomejuvujinimepizodika.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021aea43eb---88896945086.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404dd9a1893---nudodexonulekogatenop.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50863278983.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/11087530600.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/dijujid.pdfIn PDF document text
    • http://fgosvo.ru/files/files/96896667108.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/4630074841.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dujipabupepigemo.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xixibulojewukujajukukimax.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/piwozanifidaronavu.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/garubomoludowafabe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f264ccc4c5---73295484476.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/19063175551.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/23541708787.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/rewizomob.pdfIn PDF document text
    • http://dytac.hk/userfiles/80065700466.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/14629646940.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80360580211.pdfIn PDF document text
    • https://nexapos.com/upload/files/49948857243.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/48ad3af846809926de1da2a3d45e4c3d/11052161084.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/89696985961.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_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 18108 bytes
SHA-256: 85eb3b5ea55e457296346764bad8e56e1ffff2af98129ff6196beb837c2518ae
font_01_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 10536 bytes
SHA-256: 43fafdd024665771342f6291e062121568285374009a996e4999fd62117e040f
font_02_sfnt_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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