Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba33333340af82e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-26 13:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2807c7178b4cb7875a75d1f51e63e4db SHA-1: b5845638bf208085df5b5a2aa79492557588c319 SHA-256: aba33333340af82e8b90af3f93b65bd61da8cf021182fab32031329f30123f22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential harvesting lure. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to phishing pages. The presence of MFA/one-time-code lure heuristics strongly indicates the document's purpose is to trick users into divulging sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://interel-rus.ru/test/sites/default/files/file/62414348809.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5c297f36---limebagilevakexu.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/83806622983.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9fb38015---35370012085.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/2101819957.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/fagagemunoduritu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083703b0be64---kususiberurerew.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a7a246c6---xowemasutejalalakewodusam.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ld1ui31o6bc9or1s8m5npo3b8r/xikadar.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076adecaf467---3253263447.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/katojexudivore.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/86659525824.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/mugewonudinagigimugoruw.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/dorujuzikojunegajibibufi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/92080390586.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/57313617270.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/78645156f520f8cdd6bb254f60074893/96693921831.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d11ccb9ae9ebf1ac89d3b301d1753256/bowobavo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/tagefusipan.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gl3115vra92ickpcui3htd2md3/48943189774.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607892788aafe---85169378354.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/napewezobusajasubo.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/95744691380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amazfit+bip+lite+firmware+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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 17476 bytes
SHA-256: 3d856f78c8303adb902936984d6109da3ff5111940d41f1ab63912e114a4c7af
font_01_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 10760 bytes
SHA-256: ceb13a4e9c7073f55be4b5d9a0d5f61c7d785d04d99e496a0602e83466276c32

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