Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb9b6f28ba57a1c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 11:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d693adb1b87ec29460028d5446cafa9a SHA-1: 0120b854aafdf2f7059d726bec257a6e2e445eac SHA-256: 7bb9b6f28ba57a1c778a106d0265e2bbc1d807a983a284073c1f5da1f9bfb262
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://chcial.ru/uplcv?utm_term=hill+climb+racing+ios+hack PDF link annotation
    • https://mimpishiodua.com/contents/files/wumimagotiginatin.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/fubarabanifanesekemanini.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/palaz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161313a8059ff0---65919382936.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/11898348345.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/76666115417.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134535483ab2---rudoli.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/daloriwidezu.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/35493655047.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/68751865177.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rejugurenidixuzegojanise.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/71182662111.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/57049892278.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a47760ee3---68288121143.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mobewogo.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/bejobevifozozulizojep.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_0C7FF4A698A2C963.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/zepugamujasevawenu.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/70810599010.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/tolonataduvef.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vafipakigodiwebuvawixoji.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109050501554063.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_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 10672 bytes
SHA-256: 63c2f30a207d30709f2e384a04f5ae2fb0a02deaabcc1cfec526658ae4c4adcb
font_02_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 17580 bytes
SHA-256: ce966814125cba26e12ad345d74e1facdaa4081fb1975df72b1bd4cdd60744bd

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