Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a3ae77d99cd642…

MALICIOUS

PDF

101.4 KB Created: 2021-06-30 02:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79888775cfbf17bfe6ad6cb6ef56e989 SHA-1: af844ed9a3ba95041d34b0516e79bcacff69e032 SHA-256: 15a3ae77d99cd64264be29c346cbf820ef366d1ac8ed08acaa3a837a780b609f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://drafthe.ru/uplcv?utm_term=computer+control+keys+a+to+z PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c81b867c4---70057073842.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005391a19---tesiximiw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/temokewaze.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/voxexeriban.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb60e3144---86874845527.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106050100303682.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17b026253---mubugukesivigeser.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d88726a0c---fatasir.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f93074f4---43629577456.pdfIn PDF document text
    • http://bwc.lt/i/nafox.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/2811978305.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/17508613115.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf92aa9f1---32053083358.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/javaxojigelonixanuv.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f54aefdbe6db38721ffa54c6892c39e2/zudajumexazigobunigamed.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/55424300202.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a04d271d9671adec1d3f52e680d4b53d/97591882794.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/desoburez.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d11bc557---41139068796.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aad17f5a6d1---29071939988.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eb05ff55c0223ff19180f079c32a6096/25884916713.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kmidvpumsu03s6me301qvrhl16/gawineronivunemovuregeki.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b2dd8cc7---97946031198.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/57537028593.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16084 bytes
SHA-256: c23a78767c17a1614fb89d96e2d4a0bb3f466bbc82d371f47e982e9626fb525c
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 23068 bytes
SHA-256: 9856a8b6e9ae2a249eb28273cc0f6f0b00348d7f15fd254aec82d193d2444e39
font_02_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAD 9204 bytes
SHA-256: 692e78f9845cb94a37c5771fd2230d11b050ecd8758affa6a9f94f21e23b7b77
font_04_sfnt_off00016f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F00 10840 bytes
SHA-256: b7c3ca3f3217b2c977e426a645d84936b7d3372cd52ae797d195cd375da4c994

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