Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c512c3e010d8b44…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90f1fdb48dd93e75e7e6ac0147d4349c SHA-1: dbf76861585b0b5df58821476f460ad91f9ccf10 SHA-256: 6c512c3e010d8b443681b8e1f015a9fe2e0e549c42da34389332babf5b628f32
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The PDF document contains embedded URLs that likely lead to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3087

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://inwebjor.ru/uplcv?utm_term=dialog+4g+lte+apn+settings
    • https://marblo.ph/app/webroot/img/files/12126794837.pdf
    • http://diennuocdanang.com/uploads/image/files/42949549776.pdf
    • https://menu2uplus.com/images/file/45002109144.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/lerugiguremenonap.pdf
    • https://ever-progress.dacola.com/upload/files/worisalaguxeper.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/59476422250.pdf
    • http://taiwan-casters.com/userfiles/file/dejofoxifesovebogamazeg.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/66e60da656546c1f296b678796b9d7b7/53935693965.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419f80b4365---tomovogosupisigonujur.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/9096997528.pdf
    • https://s-h.cc/uploads/files/202109072136572926.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/11562691899.pdf
    • http://indemo.pl/Image/files/gowidotufeledilomutofozul.pdf
    • http://co-mit.com/uploads/files/mupusefogarufevaziru.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1d064776---31762688005.pdf
    • http://viprealestatebrokers.com/userfiles/files/11118095088.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191104223587.pdf
    • https://hexema.com/FCKeditor/file/medovu.pdf
    • https://permargi.com/files/galeria/files/99680057865.pdf
    • https://lapakunited.com/contents/files/kemufi.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/34417478565.pdf
    • http://shyjjc.com/v15/Upload/file/2021961833171414.pdf
    • https://natatourism.com/userfiles/files/lateforutuvetulufowuxezig.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/nederedo.pdf
    • http://asavn.vn/uploads/userfiles/files/zefofobovirigetiwewizigat.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d59b0f56a99ab9eabfcef9bb9bac35e/84879646028.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 16792 bytes
font_01_sfnt_off0000ee94.bin
323dbab0fcbb6f43b0f6854b60684ce81f776372990ede486339c4c1b152ef5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 10408 bytes
font_02_sfnt_off00010649.bin
a0e0df913646f45a9d262997facc93bdda287d184c80a5f6262dadd3e27a0cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16952 bytes