Malicious PDF — malware analysis report

Static analysis result for SHA-256 414a949ebb349bd8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 04:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5cba926c5bff0e2d39c1ec2c519c99b SHA-1: 71195baeecf4ab706033a750c34b2a35ec3f351b SHA-256: 414a949ebb349bd8eb4d2203ec3409241ab5f2dc3b89653a5a490053b2f5aac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0675d54630289d84332a0ba01f183704/gukanolux.pdf In PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/bedemovaripuresofa.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kexusizidu.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/68582639044.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e815eb4a89---wipozuzumewevifuj.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/31257493284.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36a1951c1---14011712616.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/38221354203.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/41620421164.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210604_4FEEC737CEFA6A25.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3b9b0d3b---55473965305.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e414a671f07091f1819aaac569c758a6/19052796101.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/govabikebezemeremet.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa45831fc2---68037817312.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/60481787297.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/lugapaxogoz.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/49394586429.pdfIn PDF document text
    • https://veljun-ldm.hr/files/56715280434.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114020295e2f---63983978183.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0f20e384---dojanixifesokulogimik.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/morisajewawug.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/dekewafavixowozunabogofa.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/gakofewe.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/56955934143.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/13fc5797f61a54c873400522fdcf8b84/vujefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=entertainment+weekly+magazine+pdfPDF 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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 19744 bytes
SHA-256: 4f40e310fd277132af8f085f608ff32b87e32dde9d47b244d40885c60c634f84
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10888 bytes
SHA-256: 726eddf8d9274997c54fe97d6d4b68855615567fccbd3445ccfcce154be368bd

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