Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403a0b82977625f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 02:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cae491754dbe95cadd7566ed9c3885f0 SHA-1: 11080c66ae592611909dd3e01077247ef2285286 SHA-256: a403a0b82977625f8397988cbc38e401e5c8d9b105fae1bc12c1b96b659ce2bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious content.

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2fb87e042d6abb2f6185af4951820ff0/wunoweme.pdf In PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/76504891491.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/98437705608.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7824a1990c72482e92da953435a33a04/figabenipuminorepiwip.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985f6761578---18619025842.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160979ac9198b8---nadajozafuxifa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cbc3693c4---pevumit.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4304dff19---26938927570.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lurekuxepasujedok.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/mowazizilokonufewibewuduf.pdfIn PDF document text
    • http://labonscafe.com/userfiles/gupuwoxiwul.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202108230348044260.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e6e24863---gupomorosijuxojo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zujeveve.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c636b1fb23d16f39fadd5176a7056ee8/21000884654.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/48295627833.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/17172974261.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/49766485369.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2c390aa4---kejujaxigafexepurafi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/91900a9c1b4b9910d75eb39df256925f/maxoxunikoxutonozirejupej.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d489b9da1---funubozesutogadot.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/47241684940.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/birinanex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=combine+pdf+files+windows+softwarePDF 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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 10916 bytes
SHA-256: afe03aa8fa9f90fb8a3f6df18d7a8e5fd9008bdf2be112e2a1cff72a7d62a18d
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 17440 bytes
SHA-256: e880b429b21be933f5a9ee1f286cf8ebdeb74fe2787d4645fa482e6d77beee21
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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