Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ad6876d129a28c…

MALICIOUS

PDF

150.3 KB Created: 2021-06-26 05:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89a6c4c44f6a06368bd87ae5620979df SHA-1: 9d3a9576aa12062c967306173975c7c09fed940c SHA-256: d5ad6876d129a28c99e1f920c4c8a4ced53ee988f86748785ba2ef814d2e7cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5gj84qblksjt8e20c9nercg8gj/46171495800.pdf In PDF document text
    • https://nepalimodelagency.com/userfiles/file/zebokuronomujelaxavefof.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5719352d585af8dd2e1c8f269badd569/60396629992.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/lagaloku.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/76939117004.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shm9rvh0a5c6hjomv01m907kts/86744848960.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jefotedamepalujugol.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e1744c1b---xaxivoxokigowat.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/47951150002.pdfIn PDF document text
    • http://df-foundry.net/d/files/88695327440.pdfIn PDF document text
    • http://abnicum.com/files/file/mekufuvofutosefot.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/605f563d112284515ec570d133939fdf/zoxadoxobikozedew.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/16955932d74e114f013056d4bfe30473/69270272804.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/55646052014.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df7179cc38---xifuguribumoligo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9f621494f505d9b8a728331b2b0324af/83450259730.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a995658d66b---kabidusaxebikenalanamebok.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57787d195---17036673787.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236e05or2o3vvk3rdda50tsf95/55383302564.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9600e06ed31b50cf161fc7885f46139b/zunilibetak.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/bijajobadapas.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/62443e70e13298c821e5eb29ba29775f/41131234937.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/71045bb820781c5df6e8dbbe4e9f69de/49916622768.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfc784499aaa53214c1ceb81b3397b8/97040775050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=about+the+abdul+kalamPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF9 10364 bytes
SHA-256: b3de9bd6a5b0352cc79802c43c4ee45fc222673dbf7195367f4e3402b9f4b8d3
font_02_sfnt_off0002026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2026B 18348 bytes
SHA-256: 3ec3d8bd7e04004738e0557cf23f4e016c625c7360db52228022c09af1109ba2
font_03_sfnt_off0002327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2327A 7244 bytes
SHA-256: 4c802d58a9ce6d081ee9dc13a5308644d4dbbc4c0755b7081805972e43bb4a84

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