Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e83906fec58cd41…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 01:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0d9880f5bf463c203cf8770f758c76c3 SHA-1: 97d3be929b95be38d9c96b927151f184b2c526b6 SHA-256: 8e83906fec58cd41f995f78f1dbd3db41bb94df7b64f46ee26c08fc0196f956c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically using a fake CAPTCHA to deceive users. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://krisoc.ru/uplcv?utm_term=free+fire+mod+apk+unlimited+coins+and+diamonds PDF link annotation
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/xitop.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d938b9ebff7d82caf4f2f06edded2a6a/19339411894.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/maguranoguvil.pdfIn PDF document text
    • https://olterus.com/contents//files/46568199494.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abecf0872a---56338523028.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jipabaked.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9567f647e8---wizufizugurojaxara.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5e24ce941f6c196375827876a38ef82f/53701755016.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d054bd333d2bc7cc9711da822247605a/81296100733.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/96007879895.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098378e2e3bf---jowetadezi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fozumumefifotepulilexame.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cce2c38f---vuzomelelelizonemuviwuk.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/3262135520.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/xuwom.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5r9b7e6olgjnbfl4viiorf5iq0/88605485622.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb108a84e---35770402629.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/298468cd2e27c895299de24026e70de5/82446199548.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b868e916ecd---92509935609.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3tdlmp0dqp52od92pf299e101q/14917018200.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420364c952---namovoguniverex.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/161401eef8cccc58a0b580cd3c9f42c3/91580008375.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/emp785qt1jrlkccdugtaavltgk/75111692536.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6bfcf9f80b04dba224955d231a453597/71147808225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10948 bytes
SHA-256: 328881a736d0fbf598964488a485898a7c5992baa8e11466c16b05c60f13a181
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 17044 bytes
SHA-256: 3c6555fc588eb363cf1a8d635db41c5ac9cf362f7a1f5c89d7324d696ed78ea3
font_02_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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