Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9cc3a365789477…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 03:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d598784d18d705e228c39f03cc92c16 SHA-1: 70a42c1fb74c0e2a7763a8895ac61c3cad0ebd47 SHA-256: 3c9cc3a36578947724ed75c2c184c6d6287a9c263c4018138765c4a3c463cd46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://inwebjor.ru/uplcv?utm_term=sky+go+play+store PDF link annotation
    • http://toeicspeaking.net/_UploadFile/Images/file/losesusirujufagipopew.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/24096508974.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/98553228669.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/623b8b0bf9fe686dcfd5191001806fa8/25990570730.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/suxox.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/50057727573.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/385612_80125153520.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/59883701742.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4a24e77b6a1c69304ead8ca4463dd570/tofuzet.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/33252951895.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/zejofijab.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/13484192376.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/31924688143.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/sopuxojawuvar.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lodatanewibofegize.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/58783789013.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/pizixexezuxisigadakamiser.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/70649878033.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/xoremanil.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/zugufakenufexeretuveno.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/pabejadezagudemuduw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359fc7e6cee---5013049381.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/to5422k07oepg5r761il6rdokp/28947469940.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 17708 bytes
SHA-256: fb2ca33f784c3acd24a1b8269deaa000a74db2682dc9ed6a8fe4c974bc5bbbb3
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10512 bytes
SHA-256: e7aac00af2fc624bdfc83e06e916bb6d5a3a2ab3e2d4a1d1dd9ceecee86db6c9

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