Malicious PDF — malware analysis report

Static analysis result for SHA-256 10568517d5ca0170…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 12:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9276c61a07fb0ce895a88625648f67f0 SHA-1: 55e8eb1382de9105c1d2348566c92c8cd4042b59 SHA-256: 10568517d5ca0170ffb8ca7d52bd8bc8f02aabdfd17363cecadc0987d00af997
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host further malicious PDFs. The primary goal appears to be directing users to these compromised sites, likely for phishing or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa58b3925---23105802526.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac49826afd---nipata.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160932da379a9b---zodinojub.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f61333e55621aa79482aff7bd6ec083e/31978144251.pdf
    • http://www.alfapilates.pl/upload/file/84002823834.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hbtpv6u35im6vvpjosf03v9d40/24844618275.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071d31f249e6---25726251782.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/46067655761.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ee55cdc7---vozasegofeditetejeteneze.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec1d45b5b---23631183895.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d37d1288606db32167a424cd87a82a66/dijupi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcb5c5006---xemakejadowimuv.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc071cef7c---gosoxavusifagufukore.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/644d3f582be1ba4d6feaeeec129c3adb/serile.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dososimifafare.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34e763c54---wodufofokatukunatebanob.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7q4r7ciitu0sielu9jc804dahk/27017953782.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796f8b0da51---vavurivobuzetazadegiwatu.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03bdcbcb40---soburuxulejuxuxo.pdf
    • http://fygl.net/uploads/file/240007433329.pdf
    • https://majorsagilekvaros.hu/uploads/file/sivikuruguwonidijamurilu.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/41cf12d69019d83df36487d7b375694b/83454692177.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+best+way+to+learn+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb62.bin
e4e091789c4db68c02dd3351dfc112bc9b51e0f1804c94a0daf719c5111fdb8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 16852 bytes
font_01_sfnt_off0001163d.bin
3dcea9ba79317c37ac1d1c1eabe64457e16e3008c6ee92f5d0c6207b93a2feda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 10720 bytes
font_02_sfnt_off00012ee4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes

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