Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8fb880f3c1cfd4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 08:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 539c994abe7b10c44f602c4ef65eaf12 SHA-1: e50195a1c553a93ed01c6bc9488fde5094cb2bc9 SHA-256: 0f8fb880f3c1cfd49ec41f85c6fd64b3480ff2f146fe066a6232fb335311cff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=silent+camera+android PDF link annotation
    • https://pui-vital.ro/msg_media/file/bitividut.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/xadute.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/rudevuzib.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/setovapurixulu.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/29617432370.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/63726811535.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/28467852120.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c53e7ae4---nurukometowajux.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pejupufegu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161338a161691b---25040502303.pdfIn PDF document text
    • http://signauction.net/userfiles/file/guzafofajopoxoz.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4dcd0c7ab36b829b4b9328135e29730f/29521767454.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bb9ece76---49482365564.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/23444846568.pdfIn PDF document text
    • https://wsbtitan.com/images/file/luwox.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/puzuzemukelipevonutazina.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/tegalisixap.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/mijunibafesasuminujij.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/vexigijiwakovagak.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/bolunowujaluduwipireti.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/63380987389.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/62137519645.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/39584215202.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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 17976 bytes
SHA-256: 056f6f205fe0aef2c3868e38d78fc27136f75366f2e4336ba01d0d0c00be2e57
font_01_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 10440 bytes
SHA-256: 198bace76d559099c74cea2c0eb7cfd29bf803f2af7069f8529905fe72d31d73

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