Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b3ac23c461d68b…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 17:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd0e36e089be8f3f3f95168ef185ea93 SHA-1: 2cd6bad0a470655639da920b5fc379db52b88da4 SHA-256: 78b3ac23c461d68b6f00a16f587395f777cb819c04bb7c5561c87cf25805766c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the nature of the URLs suggests the PDF is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=ma+in+reading PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becdd71a3de---xumawogefesozuketugonifu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8e724277---52830997509.pdfIn PDF document text
    • http://aa-nusd.jp/4833339472.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/52028343cf1b2181b48b388142e90b04/24145011975.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/il7h615ijnun34187kao3bt1e7/rojimimida.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/zugudit.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7c39f62b9652549619c7234b3f0f1a71/kegudujasolosarorex.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3qdp31pq048r1p6iqng8vbdjmj/41539020942.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/69cf700b2352e59fc736ab6e7ac8618e/zijipisasapego.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/63994173273.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/95449286879.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddd19efba---51826150727.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wofaripamugevifevixu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608db925dd817---21403621677.pdfIn PDF document text
    • https://noddy.nu/images/file/nebivukuroxamulepevaxa.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/61487221477.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/limutaxipapiwas.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3dfc6a7e74fdb4409f12f62c814e77d6/64707313433.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/90004256135.pdfIn PDF document text
    • http://huntland.hu/upload/file/77862970432.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/51480a02cef11526a096b3722c4b797b/sakarokigokapinopi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qmqdnerd9kpug2hg5eouf245fv/pefurugugomodokimi.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_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 9984 bytes
SHA-256: 6148890ceb8fe3ec0183e636e591bad8a0e9241452dee593f65b3c1fb40572c9
font_02_sfnt_off00014564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 17624 bytes
SHA-256: 9a60d1611c1c93bb148c16cb5340ab6da5db8216ffc5994cff7524f0e5ebdc20

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