Malicious PDF — malware analysis report

Static analysis result for SHA-256 e081b729e2ef3a3e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1200e1da2bcde32af41e8b568f63bbb2 SHA-1: 531efe9874a8328cd59ab894194e7950d092c645 SHA-256: e081b729e2ef3a3e0d8b6ae8687eae4ff67775f630f494a9b969212393026c1a
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 URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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://www.mueblesgamez.com/ckfinder/userfiles/files/54722962310.pdf In PDF document text
    • http://avtokapriz42.ru/userfiles/file/lagekogegataseduwubi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/52165441178.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bcd0e4d273c3e9d164570ecc4d4d314e/62903599619.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gigobovuje.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kofolukotixud.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/42314946917.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/28709621267.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/pusobedagigimaguxebi.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/27701008402.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa925193---43887770572.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/68567574801.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/votepixuxogunoderamok.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8226fa9e---jixuzaroxirubo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/novilupukusezixuvosija.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/74615271542.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xoduvufilebaf.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/juxefebo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/76770651295.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/47178281264.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8b0c776c---48358922657.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40cd1d662---dexejuvag.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/13668070825.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/40056146256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+android+tetrisPDF 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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17400 bytes
SHA-256: e78ccb28ba767803e33e4e70c6e8ea0da307a845a83bfe68c965a2243b70f49e
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10248 bytes
SHA-256: e17563c9816062234d3214ff144699f586f2ebe0c28fcebb9aa364ccc7a1fc1c