Malicious PDF — malware analysis report

Static analysis result for SHA-256 f044db8d38b4a568…

MALICIOUS

PDF

119.3 KB Created: 2021-07-28 09:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4382a046ad0777ba70d4b87ca8728b90 SHA-1: 9850002da3f24d0986daba5670a5699def7d9493 SHA-256: f044db8d38b4a56891fdfd21cd6590190caf997b22572a342ef23bc2a29bafc3
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs and the nature of the link farm suggest an intent to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4520

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 https://drsubhashawale.com/ckfinder/userfiles/files/lamarabazisobufewikutuwoz.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c864c76a---85502966990.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/39b25296b76a6a3406ca446313999edb/65718214514.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46419806139.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///saxejasivomazojabur.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/4489257439.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/80551685778.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210616124323_1796664102.pdfIn PDF document text
    • https://actor-conseil.com/files/file/68079168315.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f638a272f86a3ec46ab5b04b88b06591/gotuvonurepodematul.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/88927701541.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6st8fhkou4ph6444nohhc82gr9/nasebovebirosuraxemuxogub.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/82621162582.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/renaten.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b8c2c62225ffff604a0e129c715e7894/refopolatevola.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/fajisez.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/sixeleniwevez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/547f58e5881810f897323a72a5a1764f/tibinujigekupesozi.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/55078053891.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0fc7f5b7---fivelalurabowul.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xejaretav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af3806233---wogasewakarirosigixa.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rijatuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bell+f12+instruction+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8897b15079122b910b0f8bfd77a874a5/kutemadazasezudewuwibazim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A350 10824 bytes
SHA-256: 9c7cb7642175f37a2ce0ec865f9cd835d0068fea43ef60510508b6878f99c133