Malicious PDF — malware analysis report

Static analysis result for SHA-256 82545f6f7901d6dd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 02:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a69a1c8db22dcb68648c870f01decf1e SHA-1: cc857e830ba7bc7dd99770d84f828217eb4ce36b SHA-256: 82545f6f7901d6dd5f1e54443011906fd132c808ed9061f09d4be7d225128d8e
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings strongly indicate malicious intent through redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130354773ab0---22455761617.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338488cee3a---43198829319.pdf
    • http://ohana1bbq.com/uploads/files/66354397655.pdf
    • http://jsqnchem.com/upload/files/54637780438.pdf
    • https://yenicekentkaplicasi.com/userfiles/file/67910377632.pdf
    • http://pnlestari.com/visitbali/image/files/8104715301.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/2942835612.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/1319265159.pdf
    • http://yokohama-model.com/userfiles/files/36348228546.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0346b8d40---zuxamoresapunesi.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/btj5kqm1c1cjs0548cvl443ba7/pezak.pdf
    • https://netkat.in/ckfinder/userfiles/files/dimulezolimisikasisitomi.pdf
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdf
    • http://tomasmrazek.cz/userfiles/file/92421759106.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/gofixedo.pdf
    • http://a-kamen.com/userfiles/file/pivapige.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76702da2a---bafedawatirokimojujipure.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/pekinuwizegexexonaj.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e1a19219---worazakemuxajilojamura.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/35329530179.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/76vl280463q8puk6kj5n78dac2/puvazajawomirovadopep.pdf
    • http://narnivet.com/userfiles/files/zawuremujo.pdf
    • https://serihosting.com/calisma2/files/uploads/98804059969.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=baseball+superstars+2012+hack+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 16792 bytes
font_01_sfnt_off0000fe3b.bin
47394d113ed7b7966bf0ee0833f1835c5beedbac3264faf850df838c046e41e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 18096 bytes