Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cfa15bc275cd78…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 14:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f43c0baea57ad7c1a2768834dbe856a SHA-1: 21159f4bc55ec286a84476f04363a7d9b2891e68 SHA-256: e3cfa15bc275cd78a0f1a0395cf3f2c2d24efec58591ec3b2ee9e34050b6ecf4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to the file being a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=convert+pdf+to+jpg+freeware+software PDF link annotation
    • http://dnepropress.net/files/file/vakotutipabizij.pdfIn PDF document text
    • http://carbontuning.ru/file/26911572265.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/7591434572.pdfIn PDF document text
    • https://empresa-venta.hr/files/6334852376.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/gamezidin.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc71366aafe---94181441444.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3278676ec---19301436886.pdfIn PDF document text
    • http://rnralpha.cz/res/file/69096545728.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b49e68467---93958917936.pdfIn PDF document text
    • http://willbramephotography.com/mavepixuwifemi.pdfIn PDF document text
    • http://cecev.com/stockages/files/71144089836.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4d5df45cc2cd5ddafd5784ee126eb9/75359602979.pdfIn PDF document text
    • https://zold-kommando.hu/files/75574990754.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dopume.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/65497979467.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/76879171056.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/xojulug.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/difapux.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/rugorofetegusukomofu.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/160003547841.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/59614998508.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa81176ab---16501512021.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105acd223971---44046027706.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901075125499531.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aa8df5a5---zikinuberikavepedoxuzugus.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zopopu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kewaxegubazenikilukuzuso.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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 17776 bytes
SHA-256: 4bef821890bf1f07c479fa6f1f1e6e658a7917b674437065d2d274598f809553
font_01_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 10848 bytes
SHA-256: 898d1e56cf15f47edaf80db2cb872869d3ae7cc23fed3ae1e554beec05804554

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