Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d8b768200adff5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 14:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5247fbf6f97f045d33d8c6841bcc057c SHA-1: 84a6f8b0ebd06bd94bf8b1f97955d0e40d362a81 SHA-256: 40d8b768200adff55944c358b335de781f675dd78edf36dfe4aa39250a096892
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://dancephoto.ru/userfiles/files/90104682176.pdf In PDF document text
    • https://xn--b8qxb801j.tw/upload/files/fozijobeguduwadipezufi.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/46547697940.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799df4e629---gumalepigeketej.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/daxunilewese.pdfIn PDF document text
    • http://bubb.cn/up_file/file/62190895503.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/63736998369.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9234c2d90---rubodenoved.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bazab.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/wasuxewuruditomuwakusi.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/jakefefiwifesorotugiw.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/fikavuzujewupotiru.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/97955474821.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60a025b4baef3e38f14031862aa9a592/bilofobaxorubivobufidesil.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/nafositomenasejizowu.pdfIn PDF document text
    • https://grnca.org/img/files/files/fatopekemitowopem.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/73773670540.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/58592938205.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fa55dae7807302fee348c3198f6a409a/pilalabudusamisijino.pdfIn PDF document text
    • http://mastervin.ru/files/file/20171959551.pdfIn PDF document text
    • http://mrybalko.ru/files/47202050212.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/bikejanojofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=legend+of+dragoon+androidPDF 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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 18316 bytes
SHA-256: 0e8ecd7c601adadd8bd16977a989b2b2db14c04912880f846a747818bd4491ef
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10176 bytes
SHA-256: 4232d9e45325049fc36c694a2ccd93a3f8f6bd83706033eed8f79b1efa386a28
font_02_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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