Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6a29e741c44a6a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 11:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68ef8b5a049b20871384956cf14252e7 SHA-1: bed8dc8403d3dcc317fcd49401df1c9ff92abed9 SHA-256: 6b6a29e741c44a6af52b6f2b01d6e0d9feeec5b476baf94214821bceb9815d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload storage, indicating a potential distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mariekevanvlierden.nl/survey/userfiles/files/60702777139.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc06e94ec---gulure.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/44172482168.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/85278008466.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109090515366775.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xedubimod.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/78381481358.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/finonot.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/pakagitokavojixenowuli.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c707de5---wamafazojad.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc3dd99fcb---500082835.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/semukugar.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/89399261839.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/viragezakolifupim.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/fuloxeseraxijiraf.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b119e58d40---tuxanimukexigarapapi.pdfIn PDF document text
    • https://adikmanis.com/contents/files/18333477380.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/13142034182.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/71866522937.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091213050273499.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/3987428805.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vudurowezatedefon.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7591447f7---13786159034.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/bibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=realms+free+to+joinPDF link annotation
    • 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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 18092 bytes
SHA-256: bf9bc3121651d640b5a7dace9b57c4e3a29a806bd17b34e9a109f9c2b514a075
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 10548 bytes
SHA-256: 48c74e64f4ead492c09ee01be91143d57d9d3b55bb1ce79ee494642b67ac56fa

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