Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63b3bd0226b930f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 00:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e80ed14794501e393378b00b2292bf4f SHA-1: a5dade6cd6c803723b01e3f6fcf96e7948b6a006 SHA-256: a63b3bd0226b930f50a112266c6a0f9a93c01eea55c32ec7bb04ae4c1416eb31
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, pointing to other PDF documents hosted on various domains. Many of these domains appear to be compromised or disposable, suggesting a tactic to distribute malicious content or phish users. The presence of UTM parameters in some URLs further indicates a tracking or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3958

Heuristics 4

  • 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 http://alexlunacoach.com/img/editor/file/gugijigabave.pdf
    • https://eqonetech.com/upload/userfiles/files/20232842932.pdf
    • http://nazycakes.com/userfiles/file/notogixolab.pdf
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/54056330642.pdf
    • http://danchrisjewelry.com/userfiles/file/38292104011.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9add28b66---wepokasujama.pdf
    • http://j-line.ca/fck_upload/file/88684649472.pdf
    • https://hoatuoi360.vn/uploads/files/60709164072.pdf
    • http://cn-daomeng.com/upload/userfiles/files/01538a95c02db7ac0b023070707d05f9.pdf
    • http://candemdientu.com/Images_upload/files/17650309135.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/396c12e7997fc52f4702890e2db4e180/gasaso.pdf
    • https://emartdeko.pl/galeria/file/bamidogibitodilividuwexor.pdf
    • http://xn--80aa5alfu.kz/file/zewevusopu.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/56540506422.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/295545af4fbc9b6158a5b61bde4a44df/20780283785.pdf
    • http://goodlife88.com/uploads/files/fowowijovodega.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc206e82c7---dazarin.pdf
    • https://datenglagi.com/contents/files/85980184405.pdf
    • http://meimagedance.tw/ufiles/files/dolapukatu.pdf
    • http://automsystem.com/UploadFile/file/20210913005418449.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/94971ad91e9e40ea4f76d4284416f0f3/kobowusigevovufabara.pdf
    • http://klwas.org/userfiles/images/file/84511709819.pdf
    • http://azinsaghf.com/cache/fck_files/file/39673193796.pdf
    • https://condominiovillage.com/userfiles/file/46084440338.pdf
    • http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+best+way+to+get+flint+in+minecraft
    • 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_off0000c430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 16792 bytes
font_01_sfnt_off0000dc42.bin
f9a50cbfee667305b6a6a9f0f18011f66d1c5420410a44d98bb0908dd5a309b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 17092 bytes
font_02_sfnt_off0001081d.bin
0dc8a0d693e0484eb08684628b9fcaf176da5cc695c1520030ee411bc7bd38cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 11116 bytes

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