Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71a73eee3bb9e39…

MALICIOUS

PDF

98.5 KB Created: 2021-10-12 02:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1759c556bcb1b07c4ca18c29e214c92 SHA-1: a1068fac257a2900bd698c02b43b068d240bd68b SHA-256: d71a73eee3bb9e39694f71a5ff5e19e3922c5f2573e805a1221731df9b4e2e95
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and a high ML classifier score, indicating malicious intent. It features a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of common malicious document delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.urbanwaterways.info/files/wukozolodovaf.pdf In PDF document text
    • https://seeyounow.net/userfiles/file/saviwufutadi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/4585606609.pdfIn PDF document text
    • http://dasbluemchen.com/tonakapasabozuz.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/kafozalujokadutew.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/95410734873.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615304ca06151---31674029479.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tapekekoxikupad.pdfIn PDF document text
    • http://castel.lu/userfiles/files/jesubokalujusutipixomel.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/riluwa.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/30151905893.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/5740361571.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/55446692676.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69330768197.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/sokozudazom.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20211009_180451.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/912f17edcdc287325d97e0a0de1b487f/84041121883.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/57501615684.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/47904900592.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sixajiziwidokitaw.pdfIn PDF document text
    • http://vuason.vn/upload/files/32884498660.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6234a9c6add1bf5c394157279d63605f/gakediwuwirufef.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/35212747931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=import+pdf+to+autocad+no+objects+were+importedPDF 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_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 11144 bytes
SHA-256: 905f4b6685bce1b9c0081bf1097c3de77486b0acdf41d37703a72040464a76fc
font_02_sfnt_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 19112 bytes
SHA-256: bd0ef5dbdb9b50d0ca63ffcd8df2ee3136a3c37adcded83a43d2515889271a97

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