Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c6852a0745fac4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 06:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cbe60d428480de0ab6bc56d49e5a156e SHA-1: 286b55491041b34b7e49c9992d4a996a9928daa3 SHA-256: 48c6852a0745fac436c2cbfdb518c9d8b54eec5a85f3302a8aba4263fb29bde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=pc+tool+for+veryandroid+sms+backup PDF link annotation
    • http://kiddeefire.com/media/userfiles/files/71076564510.pdfIn PDF document text
    • http://zzquansu.cn/d/files/pemuxemirofelogete.pdfIn PDF document text
    • http://santehnika34.ru/images/file/6895510926.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/meduvesojexur.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_092908.pdfIn PDF document text
    • https://le27.fr/docs/file/navijiwi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0b6f32ce---62037312906.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58846227952.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/fetalajasoduf.pdfIn PDF document text
    • http://c-amc.com/upload/files/54357843137.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zelegi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136372cb310d---48267688578.pdfIn PDF document text
    • https://orrizon.ru/images/file/92221653839.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/3502452125.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/33559758415.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/94932829420.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/79754595035.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/27909804799.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/35815925410.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef025e43f---wevefuj.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/sabuberemelomawiz.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/3038410259.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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 11296 bytes
SHA-256: 18dbef3d3b74cd3afb64bf171cc036f38b2056450bccaff4f48e29ed81bcb86b
font_02_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 17584 bytes
SHA-256: c3686a9fac638715b459d5c306449c47e300c8eed513b51529357839048dd9de