Malicious PDF — malware analysis report

Static analysis result for SHA-256 984ff3953ecba200…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 20:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b1b79bf2520dafa0df63dbf2a40ab40 SHA-1: 0b793fe624080c2622cf0728d16c4c71dce33185 SHA-256: 984ff3953ecba200d3cc3cea27c21017b6c7f7916b3db2fa24b7c3e323c3a0be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external, potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=indonesia+budget+2019+pdf PDF link annotation
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vowumedazuwetiferik.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac4f92612---41878427073.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26671424624.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/74363190976.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/dipokamapefowireduw.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zanan.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/seporu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e6b424f7dba013090a94065d60d553cf/gatuk.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/xukonexoxosuda.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/dosuk.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/11054691343.pdfIn PDF document text
    • http://gabortech.com/admin/file/93164225757.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/xorowikuwuwevige.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/67be7cd3ba16130148266806c51b99ce/53319376051.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/539ad4ba4c5c9022d791fa6ee2544aaa/15671237318.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/11490452830.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/jedimakogajipugineju.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/rerevatajobi.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/58490607605.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/kibenefix.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dc079d2ca---47026495703.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c797404db9a---9935888411.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 11180 bytes
SHA-256: 1aaeec34d9d74eb126044409b2114f23850ba7b12f158df8bcc8d2152ed50198
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 17184 bytes
SHA-256: d9a47402665f25fb9621d81c4979628161de6a4f08db550b4b554912ac0c669f
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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