Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94dcddea7dfc6a5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 20:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5fb3944bdcba6755868764836d7140b SHA-1: a50c08910202a68f64f3f8a9d4e1c959857a6e4b SHA-256: a94dcddea7dfc6a5df785e62b2c226bc0a3733e6aa33309edb8397c694d0672e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories and other unknown hosts, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174568a91e---84903537456.pdf In PDF document text
    • http://mvdeastudio.it/userfiles/files/dijikurin.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zibonelap.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/21226114437.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04150398---17437794362.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/52176041824.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/83641447822.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lowiwunilefagajujakin.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/5300870944.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sojivuzokusirita.pdfIn PDF document text
    • http://mcutech.net/files/51292281634.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161429fed26b96---99013065403.pdfIn PDF document text
    • http://pasaru.com/upload/files/kekanelavepen.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/rodagiwejovijero.pdfIn PDF document text
    • http://schubert-hh.de/image/file/dawevumomadekaxuvu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75057097720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tech+hack+apkPDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 9796 bytes
SHA-256: df34317fa2dea01d30199a845a82620820a2b0cd613f74eb45d1e467532b6b63
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 19364 bytes
SHA-256: 7ba11a34b5ddc713e1d5cfee36aff5b765b1354f55fae925f6c2efbbface9bff
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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