Malicious PDF — malware analysis report

Static analysis result for SHA-256 450955aa3e6a9203…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 15:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aaef1717672a181d2ead12a53394324 SHA-1: 667215492dc23e23a3617b2f996e303a5a07a36f SHA-256: 450955aa3e6a92034ecd0334136cc019e1bf0e5b1ebdbfd99bf5ed2d4465af0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress sites, which in turn host malicious PDF files. This suggests a phishing or malware distribution campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac785b0fecd---83326989291.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5221d12028---zuwanep.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/vufugubumebasezokiba.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/140435010.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/lemudelirenavivide.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/03s06mf1fvakjips32e4t7rqr0/bujezifanopurufon.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/82860160751.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214302045399443.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zijazexevibasalukatelitu.pdfIn PDF document text
    • http://xycrusher.com/d/files/bawapuvasozexedolefugate.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/28028607849.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/26838967824.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ae82205c---7933018407.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/liberixologasakemub.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f47eeff1cf5ea3b66d21f92dbe20f3b/zusagiw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070870695d8c---zagepanojam.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/545895327.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6c4c2e5a---32475914867.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/ralexorez.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/tutawedogulem.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/25409724991.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16240505345378.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fed759e31---95186840230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2018+hyundai+accent+sport+manual+my18+reviewPDF 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 11552 bytes
SHA-256: 029ffee5b1373bada665f1ae743e0de401e80dbb1e979484a0559b1380333fbf
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 17904 bytes
SHA-256: 7196df4c953f42fc0ba81aa23c7c409eb896a7613c4bec55aa92ef1e3764bf59

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