Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b2e0b71e2023b4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 10:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10e4d3661723cb8556baa2eb4c781681 SHA-1: ca2cfc6086ebcd37d16825103aa171240b9789a2 SHA-256: 66b2e0b71e2023b4165d932578e444d11a968fd9d6b4c14c806c891bf7a06129
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bomando.bomsolar.com/uploadfiles/files/402378842.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/96713553727.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae0553683---pedewinesotifidikuvureki.pdfIn PDF document text
    • http://wych123.com/upload/files/jovafijogoxopowaruwud.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/feregafapez.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/nuvalobun.pdfIn PDF document text
    • http://aweibel.com/Photo/file/juvorozogawe.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/nenowuzilusajof.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/pizolebaputupamajujudav.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59dba7451aa71a205c039c134fd0c9b9/15742289199.pdfIn PDF document text
    • https://tmtteks.com/files/90905355318.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/ronedosi.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/tileponenurorejisi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7fff53724f2ae9fb7998311545ad6b67/vesad.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82b413776---6934716737.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210531_4CA57EC917ED7E0D.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/58610536168.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f975a641b---84072392246.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/76234766936.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/46qq65a4o9r7ds8v0qle2k74ml/31844494587.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/bovagogavol.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/puruweba.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wibetuxilawapunulor.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/nujibavinakujebunozawiriw.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/48832326334.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/ximodedetutefupojuput.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a040c5264e2---33543981008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=inbound+and+outbound+tourism+pdfPDF 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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 17652 bytes
SHA-256: a9122c600dbca1926d82524ddb2c2148e25c2a80f4f258fb00388ace5ab042f4
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10672 bytes
SHA-256: c174263cb58544a233f8a24f05877c87293e65a41860a1c79d7e60463017683d

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