Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fdb62450724947…

MALICIOUS

PDF

88.1 KB Created: 2021-11-08 20:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 687f82ad6c2b0770166a5143d9cbb96e SHA-1: 44fb738dd98e1eeb8bcb9c0c1bdeae8ce66ad3a1 SHA-256: b9fdb62450724947aef1860b1089b15bc046b5a83e5010d47a73aca231ddcad6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests the document is designed to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--b1adcbbai1bezln.xn--p1ai/content/File/jixodowupix.pdf In PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/somumadokojurulepesitef.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9a2a5af198814480e16bbe65ab796f09/dosibewufexutawurujekuwo.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/setalupokuwajipajex.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/xozukagujomumigowixesexo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd97b0e51d---zujupapoki.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/32686908972.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/63619007062.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/sijabosusufena.pdfIn PDF document text
    • http://geotersrl.it/file/tovek.pdfIn PDF document text
    • http://runo34.ru/attachments/file/xaleburijizewovotokiwo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7n4j55qg470ikpuvd0rvlqr83i/56038020543.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/44598727631fcf97dc77dbf39b2d6691/luvesuvaga.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/joligax.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b53ca0d1cc0cbc6c655513481241b323/tokumof.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/62509235957.pdfIn PDF document text
    • https://ccrm.dreamcoders.net/Attachments/File/fuwofuloworo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/44830462177.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/51356501808.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/34328103993.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/lemurofi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/92422946684.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6oda3puo3m0obomg0ak4ne1i6/61482842038.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/85432825882.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109250916487239.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=exile+in+afrikaansPDF 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 10164 bytes
SHA-256: 9eda7b27f7ead627d3b8f6d2d84404563488eadae53b993dfc04c017a631cae9
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 19624 bytes
SHA-256: 5018c9d048ae02b7f6bf3eb8498bd6000a0f9ae6d72e122cbdddddcdff97ac4d
font_02_sfnt_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef