Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda31a7cd7ee9b60…

MALICIOUS

PDF

89.9 KB Created: 2021-07-22 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 814f72e79587552c981f4d911cf6343e SHA-1: 81fc9202152930b61f3bdba94c1a607f1f7bef27 SHA-256: cda31a7cd7ee9b60c1a6ccd5cf8fd64e70161906de529f36637bf97531759633
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d415bf9c4---33696774875.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bblv2ceme9bmqpdpijlu38vaf3/13907854710.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vojulizogetutuzef.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/57457397285.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/37772417423.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/51948969500.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/32041322591.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d498f1431e2---83718512709.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/22108122586.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/c9hhov5djfl180sprrenma1mtu/molorepi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zabinepumiwotegijozadude.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/42357826519.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f95a89e0---49265670037.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce4214cef---91094086691.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jepufoxavagofuke.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/31571c2763e6cd63bda92891c816f20a/46597640578.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/xenukinulejo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f192c6a9e9e8b2a75b2e68c37a013fe8/34595000075.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/bavimosid.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/nojoresujakifuxi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ivoaipnct8c7a962q2iohlva8/18573613024.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c1c1235c---negijinetugigawenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+picture+round+quiz+and+answersPDF 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_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10832 bytes
SHA-256: 4bb9db3f58ea0cf56ecd559dcb3da815500402d73cb97cb386af1d21b74d8bc9
font_01_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 16944 bytes
SHA-256: cbc0edf665d76cb2515e7f2bef9ace68a7aa755823d26adda37673930a5f0087
font_02_sfnt_off000141d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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