Malicious PDF — malware analysis report

Static analysis result for SHA-256 999615b773b2f82d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 01:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f64de9c6332c743dde6a0fed1f795ca SHA-1: 1683dab23d8cbbe7963e21049db3bab2125a8e25 SHA-256: 999615b773b2f82d29870500e9209144564dba25141c6c00748a05286c5aafaa
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect with a remote support tool, a common tactic for unsolicited malicious documents. The numerous embedded URLs, many pointing to compromised or disposable hosting, suggest an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://kondicionery-pushkino.ru/upload_picture/file/segisubizupebenonilabuw.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/miponakiwisuzenajiga.pdfIn PDF document text
    • https://remini.hu/userfiles/file/55708272210.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/25627275412.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5cd99bd0---35457875910.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/46751831774.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/46487962994.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161359aa0a59f2---netoker.pdfIn PDF document text
    • http://wsm.hk/images/files/naviwebavetewatumi.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/10734158989.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1631379380577.pdfIn PDF document text
    • http://handgun.ee/media/file/ligezizavuxekar.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/03hokspklrlnam47hu8s3ojle6/91797994783.pdfIn PDF document text
    • http://scro.ru/pic/file/voruliburotuki.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/78355420454.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c315d7ee322aba16872c2c9e010915ea/vafuzunubijixa.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dejujilopelavaxapebik.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/vufenonebarumotax.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/8213246984.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/91013165422.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zedisexosibulavowore.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/40610878849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=virtual+dj+remote+apk+free+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_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 10868 bytes
SHA-256: 9010913550ecfd9057a6da9a186cc9558aad7027683a13938c1b50ba6b3d2662
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16760 bytes
SHA-256: 78556224a98e77222d029440523b2ca7d2dc01ba8db1775278e5b40f41cb2f20
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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