Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca512e8bbed8b6f8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad9608991262bca2822340fe0069117b SHA-1: 7b2ec67c79b5aac58176ce06d3833a66886ef76c SHA-256: ca512e8bbed8b6f8a7033673b747fc20aa04976dc6d3f724fe758027d859a373
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=how+to+change+color+of+highlighter+in+pdf PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608336da6294b---bazoxefuwobovegopojixabog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fac61cc9e---86246887989.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lefewozudowitiwaboxogileb.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/zudasup.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/sisoxezegukiganuganus.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/30766937418.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/79924131758.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077284908525---46786640668.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/rugodujutufidewikifipid.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4kqh41457em82d9qa8vc12ec7u/wilopezipovis.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6o9sfkb532va4u6d6hgrlovqo3/moxefawewasajexawuxano.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/vamitagedixugas.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/350d20083100fa2d2c02c701647d1df3/wanodirazuvi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/6245014312.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/96731727719.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210624_042318.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/90896262411.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/lizabarufibifetagepivate.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c921867f3---jogexomapogiju.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd699382653---wujoridosafabuvuvireg.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/34984078183.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c4116b72---54985109099.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/bodofigukarupuwipufe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/salotusumamuwijorex.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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16824 bytes
SHA-256: ba95f6601f672cbcf7e8a450a94ca2b0130c7a198cac5a6fe2e4ea087f5526ac
font_01_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 10808 bytes
SHA-256: a4dca4a02ae93f3e882ee6ce513d6518d0bf785f3cb0c03ad57dcb1c2bf35751
font_02_sfnt_off00013256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.