Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a510493d3353de4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 10:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d5b5c55a52cdc80e814cf425e6d2aba SHA-1: 528103b21615161383c8a09dce382882a2e8aebd SHA-256: 6a510493d3353de4e779d064251ff4ed5f82cd0ef109aa2783b1ef09e00ee3c1
156 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many pointing to compromised websites and potentially malicious files. The heuristics indicate it functions as a link farm, likely intended to lure users into downloading further malware or phishing for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=apostrophe+worksheets+with+answers+for+grade+5 PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf079d4736---dokidotobarebifu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/32b6e612f22a05c2172e5ab7ff555a69/vetijewos.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e030b41ae---turugadoko.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/20348861693.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/13911384426.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/10cd19009b2635ef41343073dfaa5361/17856318565.pdfIn PDF document text
    • http://gabortech.com/admin/file/53277929555.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612034eb365bd---lutetoxifar.pdfIn PDF document text
    • https://emmaushuis.org/pages/kiguvaxelame.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/83753695091.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/safajofutumafedepefilube.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fezapa.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/56291172870.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9c8mgn2vmdp9etrebk2rf10o80/68031496229.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1e7d299e0a7ba705d2e284dd0b84ce37/26631194716.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/32619761325.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44715529366.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8c3c044f---damux.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/22819456061.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tonidigexedukidifapevof.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/53874741715.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/393da5cd932645a9a94b47d88de0c5f4/61564836256.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/gijuke.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/17114861857.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/diretosuwif.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/40634302506.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_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 11024 bytes
SHA-256: 8da5519b89fbfcc975511e4e5369ff9f82b5eae11b2569b7d0fe43517e5b4500
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 18564 bytes
SHA-256: 7cab5a8c2ed0c08f779b7bb2f832dec711e65dd1d35f3e90edaa0f911b84c3d9

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