Malicious PDF — malware analysis report

Static analysis result for SHA-256 9530ff0886924f0d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 16:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18966b135f856728c161ec8ab29eb699 SHA-1: d8a2779c433479ef69d91e9e5c271426372b3c4e SHA-256: 9530ff0886924f0d7008e5c72b8e3a885e4d0f7e0fe14e51abf06921190089ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98742a4f9---56936238266.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ab7d262d8928544982138c5125169a5c/74483738886.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/tarebupisadagupakago.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d8470eb7---fiwet.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/2qf7p23iov0nqb22jgbprvb30l/99966290081.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/liginoxisobifidemisesunol.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/26b76c3cc9c931fd25ed94c6b0891152/rosixulukafolezibikoxo.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/gajefomoduvej.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/70302216122.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210630_634D83C38C2BFDC5.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/rasexafow.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/scneo2bd29oi58s28a925g3a1d/29350528848.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/1063767179.pdfIn PDF document text
    • https://moolans.com/uploads/files/62086223971.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/jidupigijawisoxu.pdfIn PDF document text
    • https://filetorme.com/upload/files/66325115365.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/23951970247.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceeeda4419---29710183317.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zixuxilukenexezinipufin.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/97012022739.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2fa3d9ae---82752039443.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2d4557b920274466b04e0c6961b3bb83/74062083922.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/40764151326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+fissurePDF 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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 19128 bytes
SHA-256: 87f61f14fb50369c0bd0f0f592b060a97a2b0d976c9ed4725a2439d491a07125
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10580 bytes
SHA-256: 5676942dbae265580c0a1a8de3926d896a0ddd3f1d88dcd4dd65be22217d7c99

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