Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10ebe8f363b0ea4…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 00:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0535514f54430b42965e6d98b7c4104 SHA-1: f89dd90ea79e686f68a610ce3b65f960d34b9c2d SHA-256: b10ebe8f363b0ea42dc3c87d223a37b7fe22ea26314e00b8a40933290a0de428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised websites, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://etkindenetim.com/resimler/files/wajutolosalotaduwiwored.pdf In PDF document text
    • http://twatpchome.touchance.com/userfiles/file/dukosoroxu.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/xemurujerira.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/tuwesobotigopavunanakom.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/wuledusazevokimumurij.pdfIn PDF document text
    • http://santabruna.cl/upload/file/lilofibo.pdfIn PDF document text
    • http://zaiger.ru/img/file/tenakivisuvawufadazip.pdfIn PDF document text
    • http://kingsshopping.abwingsmd.com/uploads/files/59197915331.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee7a5c637---56851195219.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/88224249138.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/xopufefifobin.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/limifexademezelagidetim.pdfIn PDF document text
    • http://centromp.it/userfiles/files/22617500071.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/mamuzunefebijegetoradokak.pdfIn PDF document text
    • http://www.ezmoving.com/file/65943469638.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bofomixikapofakovani.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/pipiwasopaxaxirevuwogeso.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/709cc475c873fad1e2f573c50a4e935f/48639394346.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/27133331471.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/wamegafonixoxof.pdfIn PDF document text
    • http://npas.ru/pic/file/dawilujomixinina.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/93289964284.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/72285440661.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8f38df0724be801d635f95f4312c40f/38854695832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf731c480c---10841685088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+enable+in+app+purchases+androidPDF 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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 16976 bytes
SHA-256: a061ce0a01228f8641dad25dbbccd2925353e88c8e0996d38ef7765c9c79b58f
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10928 bytes
SHA-256: 31848495d50058821370db56bed599a72254f644cbbed092e0a1428f95e7032d

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