Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd233161d1d4407…

MALICIOUS

PDF

93.1 KB Created: 2021-08-17 00:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da24debb20d1baaa031a4e507a4277e6 SHA-1: 093083720f5b421ac0d0fc93c148e70eb9ea9c54 SHA-256: bcd233161d1d440742943cc2c09513b575c55302e1bbc8f5de325f9b78be930f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://allytemp.ru/uplcv?utm_term=grohe+ladylux+pro+replacement+parts PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/koduz.pdfIn PDF document text
    • http://cloverdiamond.com/file/88402301450.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa716e03c---mapatavesafejuvixawadol.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7f33ae26df3b318952d251eece6009a8/filewimirodalar.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/64155750417.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wutobejokumoz.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160706604d2f1b---besoduzir.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/9582444111.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/23752698060.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/juvum.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fba12d20c20e36bc6b7ef98afdaeed5b/79364956095.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161087f1866889---wugulefevebiw.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/sawuratenuli.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/14005018255.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7206f3936---33300126496.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/29207086853.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c6c82b4c359d9cddf2c513d45c062437/47345148645.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/uol7gr3sio1he9n6mec21fkcoc/zubirusoduwefokebobo.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/megeta.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60F564E73A514.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210602174654909.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/83554916154.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f3bc2f60e32af1d7383d5dd4c923e2e/58328278698.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 18832 bytes
SHA-256: ff4d800c51c81eeacbe9fb8a6637cd4d467d02a40af7a1c341d1b7b4122b7076
font_02_sfnt_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 11040 bytes
SHA-256: dcfd2f6904cb6d286bd24444718a13005aa5afe72e5128740131bfc53e996b98
font_03_sfnt_off00015d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7D 1932 bytes
SHA-256: fc4dfeb1904199114b52ce1a564a2d347bb06f0cb4a881aceed1d20b1f6c03ae

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