Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e653777758d401…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 15:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efc4a52ac47f141757cf2b16fb6a1f73 SHA-1: b6e24f61e0cbab809c4b7dd5989bb1c93be40657 SHA-256: 12e653777758d4012a1e598c28faa8bdcb83fabbc26905e62561a95a2128ad36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stonebreaker.at/20826279380.pdf In PDF document text
    • https://poker-fire.de/file/53629615708.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/98480920266.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sunabajibet.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/31071492242.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • http://szjg.hu/images/file/vaxalujunaxe.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/12743272306.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/sefonenawes.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/19087445032.pdfIn PDF document text
    • https://masukpt2.com/contents/files/dowasi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2af11414e---66611354468.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/aaf6c76d46fec3baa820adc3532f3101/xoweruzazuduri.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/864aa4c8105699613e92cae817001c5b/83769301102.pdfIn PDF document text
    • http://erictex.com/ufiles/files/27842301231.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/29277686217.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kukemenuluxifidaz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jatopozanavonegu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/61245600496.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/88145017665.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/beporinesikutikazodovu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe51835596---zikeku.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/11676851806.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210902_231830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=persona+4+emperor+social+linkPDF 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_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 19844 bytes
SHA-256: 22d865a62d1fcdf87eab20c238b94266ff261f26a9e270b536d2462a6024fdbe
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10608 bytes
SHA-256: c1ef8e6dad3c37c35d0d4d5a9cac85bb83f2fe48312d0ef7193592fd2abd0cbd
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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