Malicious PDF — malware analysis report

Static analysis result for SHA-256 74388166a91b8ddf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61db8bcf89463b2969851700452aa357 SHA-1: e9634b61d14e6d4d5062aeacb42ce83507615cd4 SHA-256: 74388166a91b8ddf95dd94b86115879ed16ee1b15fd8db976067e19facc79322
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file exhibits characteristics of a phishing lure, specifically by displaying a fake CAPTCHA to deceive users into clicking malicious links. The document contains numerous links, many hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/78916524224.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b404954c9---tuzewusu.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/vepubakukipetenitep.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/54536840768.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5739b3ed044607c3862059e982ad0cc1/17464143722.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/75549995458.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/libuwekizovowile.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/6113059239.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613475d03f7c7---gometonira.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/likuwugefumilaxatufi.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/riwugo.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/56460469546.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/towera.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/51048985011.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bebakuke.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/66343514831.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/narorixasinosavokopom.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/75714150371.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/24495653283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hello+neighbor+multiplayer+apk+downloadPDF link annotation
    • 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 18272 bytes
SHA-256: 85c4c4d3917c3d6666cae271cf3ce6dfe2ab8247afbcb29c19ed3f55be81a55a
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 11192 bytes
SHA-256: eeca9450e57be344cc2b852e740910efe5418ba44a4391484855ee630e4b1e30