Malicious PDF — malware analysis report

Static analysis result for SHA-256 0652611a061dcb2d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-30 04:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6c55d1122d1552ae4202c3c90c542b9 SHA-1: a19bcd8511fed1716a0182c16abcb9b126050569 SHA-256: 0652611a061dcb2d533646f43565b1b3564c53653e3960958cb111ed0a60ff6a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, likely serving as a link farm to obscure the final malicious destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=marco+antonio+solis+album+descargar+mega PDF link annotation
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5ea6e7a139fe50c709ee04feb73b97ee/29089063462.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q641o545e89bjdlkqjkmu4osl7/rurivaxofajuze.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/216dj7sf9abuf5956qkafkuq4o/18353127355.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gugana.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/burilem.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd1d021d1---fatadezuvapatamodolozin.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/62851699797.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/21lfcqo7tk1j3c4jlu6461l4jp/lagavobumaburin.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/saxegavekugadoxotojolok.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/9236669693.pdfIn PDF document text
    • http://gtshotel.it/images/file/nolug.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/12076001775.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d21455827101b53b1b5194a3e14b6721/zovanemibaxuvagonaxur.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/wekakikanudev.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160febc854a4f7---42847292760.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/75181906381.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/suu7ia7io5ov5npng2uatua94j/jures.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6e299d278d6056a80ccbc222b705de3a/41835246869.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779ebb13b2e---palivimuxagomavagazip.pdfIn PDF document text
    • http://sam-global.info/files/file/budifogope.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/65079350257.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c38519ec---31577830002.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10948 bytes
SHA-256: dfac6e9ecb9c4fe3954d9ff28e5d5322461c69a10b9e7bdb02b6c66192a7da36
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 18956 bytes
SHA-256: fff4b13a2432da0ae401aaee9268a11e7607fc03c59facff8e5ac8bb29879e4c

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