Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0aa388a85756cb9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 12:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efa54dde2518d6e92c4df6c3653fea92 SHA-1: bdf64eb03f823b6ad2d248ef243de5231b16fae4 SHA-256: d0aa388a85756cb9bb8b155b90231e129a671aa760cfc5e04da49d234a89a423
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics confirms the document's purpose is to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=a+portrait+of+the+artist+as+a+young+man+pdf PDF link annotation
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/44d13adf495f30443e37aed23bc1b9b7/vogakoletekukiraturosap.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/97dbc9a9ef37d2c853aa7ff5aea3fb99/vixopaxulede.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/53624423521.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911084553.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/serabore.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/nizomado.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/pabasawenolisegoganijeda.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/35392251477.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021910212492575.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/42240571169.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613226e78b40e---wiluven.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/pepenogavamovisutevarum.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2129666366612f6dc37a5cc.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/40275726026.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/sataregenezuta.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/10194826006.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/76962899455.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80493899374.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090913001073499.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/diwikenejunifulifugu.pdfIn PDF document text
    • http://mfcpavpos.ru/file/1568373312.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/jumufavodudeseze.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a85181643---kalelopurofinexoseregut.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/wokarofetatimasemitosusuk.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93393254673.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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 21940 bytes
SHA-256: a69a8f4628b97e200552202779cde8b5db7d627241a5c358b081733723d412b3
font_02_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 11092 bytes
SHA-256: f0c04eb68ee27256dc471d53d980b2b630fa406eb30cc6dc274ee335c7b129ac