Malicious PDF — malware analysis report

Static analysis result for SHA-256 f470b4122608e5c4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 12:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a797375e8b3a2322a8cc2bb2a0064309 SHA-1: d8e077b58d2e32471b94359f1f50050aacc0db6b SHA-256: f470b4122608e5c46d274f0503785863223b3692152b79febd3c83638ecd0607
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to direct users to potentially malicious websites, possibly for SEO manipulation or to host further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5372

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=how+to+increase+ram+in+android+tv PDF link annotation
    • http://sungwoneng.com/upfile_editor/2021/files/gesuzukakaguge.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906222919.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b9ab41d9---40732936899.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tobomubelufex.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80970608833.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/69381188919.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/52392468410.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/27313356220.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/tewuxipenesenabewa.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/makavexek.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tigavopovikigepekadak.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fabus.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62923829664.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74771035891.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/43476605906.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/29154130050.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ravudirog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/tce9r5h9jp88t2vc4nsvrmd5kd/29902779059.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/51214590400.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • http://datcat.vn/2018/file/49035068398.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251658e574---peruselivitipenonewo.pdfIn 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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10628 bytes
SHA-256: 8487e8b87d5829f3fe2981b7c34d8d193912c942c81a8209a7ce492cc7200e10
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17564 bytes
SHA-256: acc181b6b3507fef2037a1dc1eba4957f7c044135873286a8670519e04016051
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1