Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ecaa86b11bb205…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 06:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69fb4002d2886e0ce171e4c53f3ddc35 SHA-1: 2730ca26a54e2cc7097f190e6b9080adc30182d6 SHA-256: b2ecaa86b11bb205e563b4deffcfbec284c9bc78f2539d7fa1d4424d618aad8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment, suggesting a deliberate attempt to distribute malicious content through a network of disposable hosting and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=ejercicios+de+molienda+y+tamizado+resueltos+pdf PDF link annotation
    • http://mcdanielz.eu/files/file/bokorirara.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/44582952221.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a5f37b4117c760d1f5943a52488cbe13/89058846006.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe6f8ada85---95806453194.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jibazudipexod.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/lulojebunisaxekikun.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/vunajuwaboja.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080120282715.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0fd682713---37627535388.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ec6e341---wuwabatukij.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/tiwuxi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/581dfbb1ea9ea172031847f6cd0a47b1/menilonelewod.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/bo1orip6bidnaus6pjgqodu7o6/91457263213.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/werutidudokisopegado.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba3859ba5---zarikulorit.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/42d3f4d772001736af6382900e4517e9/26067651172.pdfIn PDF document text
    • http://sakem.org/userfiles/files/99572016815.pdfIn PDF document text
    • http://gaudi.tw/upload/file/pavitixurirorejopanasewaj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb631828dd---76373551317.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/74456918562.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/70087169754.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 11168 bytes
SHA-256: c9afcab3ef926dd30fc27ce7d4c0469d28ed67742cb5ec89632ca65125078cdb
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 18308 bytes
SHA-256: b5d4b7e77ca93f9105f58c0ddd42c6fd804022a47d5e4e5a456bb538602514fb

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