Malicious PDF — malware analysis report

Static analysis result for SHA-256 1834492c92bfca07…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 872eb63dacf7e075b1506849ea5a68fd SHA-1: 48253e1ee5a9626078e84b42dc46691f3c95c24a SHA-256: 1834492c92bfca0722abb630824764d972005a3ca4a15ef24311c5b27532a125
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS uploads points towards an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ketchas.ru/uplcv?utm_term=index+of+series+vampire+diaries+season+1 PDF link annotation
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rapuravokadepasagikemamim.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/2689283687.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/tujogowivodagiw.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/91557322826.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/guvod.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/47317917289.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/femabejotorodiluxazepexi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f441251183---jopuvuduroverilidux.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/sorawikugebodavirumadov.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c952bd96ee---supizelitafamod.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613805bde9ac9---94873900850.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/xukipofukumepozagutuvano.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ee23878---sagawisugarariduwoge.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tepuzekilodeguzexu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/butisurizuwukojegewu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/44352855124.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/27739830701.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_6D9C2961E73BF9FC.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109120220532389.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45423216840.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/15521221690.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/xijodosipuke.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb3f2ca0---54903049824.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/7119415811.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/nilejejo.pdfIn PDF document text
    • https://scalper.ir/data/files/file/34823901800.pdfIn PDF document text
    • https://bdata.vn/upload/files/nojugetat.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_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 10684 bytes
SHA-256: f65a5531016258b6722a1b5d71d905ed7a524c23d872e0645d71ec6ae4ccb655
font_02_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 15652 bytes
SHA-256: 04deaaa765bc63f4519719a43ac92a6bcd52b6b236f919b521ddde2898c39544

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