Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd48c64cd1cc56…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 22:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07b497bffb4de4d5c2a0f700e2df6f54 SHA-1: 1fd1faf846df49bc6a9a5ea96f09f3d40e1688d0 SHA-256: 21fd48c64cd1cc564b39d60f7e6161d06bfee537f6a4ce49bdc06fe4db985c7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=how+to+set+parental+controls+on+android+device PDF link annotation
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/4731368814.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23202058093.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zomuxubavol.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cb217fa1146f4eb8c6d84a303eb8f036/75882083293.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/72853057546.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/panafikowivaxese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138e4ead7---kabinerofagajufotikapiv.pdfIn PDF document text
    • http://soc-in.com/data/media/files/nudilat.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/26837101870.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/42663490922.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/meseximete.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/retowuvujekikukaxaleb.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/12857963693.pdfIn PDF document text
    • http://fittbikese.hu/files/file/19739851508.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/1947217953.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kawavonowilux.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/jebitodowon.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/64234811472.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137665fb3cfa---73701044826.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/ratusomimetiravumaguligel.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139852b05f07---wejabujife.pdfIn PDF document text
    • https://panama4d.com/contents/files/59960292723.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/87733080147.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/madiporipanota.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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 16968 bytes
SHA-256: e6c6b6da1bd8dbedd7e3135f411ffe78572308ce6f9dacb38e3c762c8e528578
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10648 bytes
SHA-256: 793ef83f416bb91a6f8f24fedfc4113d61f7c8afd46d66c5421d52a1c3debd6b

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