Malicious PDF — malware analysis report

Static analysis result for SHA-256 0521dcda094abc04…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 17:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c57d77ffbfa4a383ce0f6f326b691f5 SHA-1: 8b13427335054c6e8ea011a487ff4725684d0062 SHA-256: 0521dcda094abc04f2a434962222ddaa7313c390d1c24765a5a5eb174cfcfa3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites, suggesting it is used as a link farm to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bedidetexo.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/r8udcc6id19onsasgsif86ugtr/89063658569.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j18sc8rllhp2rn4uvq92vsvotb/96800791863.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/60318739677.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/520cc7ddb4c7446b16690c0c9bf45257/23236450111.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9128a706---koruzivekegon.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/30490864519.pdfIn PDF document text
    • https://esz.jp/img/editor/files/54527105681.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/7424526734.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaadbf26b61---kozaru.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/26f74ab48a2970f052cdb264adf3a16e/jizodet.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rodebaku.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/zupenexekufoxenovar.pdfIn PDF document text
    • http://4bx.pl/public/file/20476636784.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/36536633524.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1a1e4641---26766266965.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nigiwomisotubexawadi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/j47nepajjqkmqscqb7md144tt6/43855662231.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aad8a3ff3---72799527480.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mitisobozit.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/93233648076.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/vimogopokizejotodu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/pumejakivu.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/volesomenotolowekubilor.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34f806accf466c795192940605fdb303/diziwexinof.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160728a1d98e2f---18732243313.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/jovuwadaforakonujuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+first+room+temperature+superconductorPDF 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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10904 bytes
SHA-256: 9f3d06c0fd5eb0e0968e4f6967fa48ef1f4c055550ab9ff59cbe49571a57ad14
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 17120 bytes
SHA-256: 2935c0b2cb65ac57adad99be630a643c4f5a4ed9d1582175ba581c6150c3412f