Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb57a538023d5d91…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d262e0a1e403cdd0603429d51f546c24 SHA-1: 183d8a57eccf35be3735b82533d51df066086528 SHA-256: bb57a538023d5d917433ad90692d33951ca39583f54b0f969489e47278d1abd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://longchimvac.net/app/webroot/uploads/files/32694952056.pdf In PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/74879980897.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17515a0aadffa6fbdd617b2f856418e8/61773152361.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210817123119_cGluYWtldG8=.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/847309225.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d62ea6951b6---14839791562.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/kolorajawidopawuvera.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cdbbb9c8c1afc702a6b88764f0d76210/rexoderapero.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/43796495189.pdfIn PDF document text
    • http://drtamerturan.com/file/36311374731.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/luxase.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/sutuzikarokizeju.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210902_418D983D302F11BA.pdfIn PDF document text
    • http://sin-hua.org/userfiles/sisazuguboxeditolaziga.pdfIn PDF document text
    • https://apra.pl/files/file/bagoxiwibadulapasoberujo.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/54481852658.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/caaeb6f3850645214ef3537680688a45/93482075055.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/tejawomalalakulip.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/rewipelukidufenutaral.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-2/20210802034549111497.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108101117309076.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1e8423a2---gazagizutumaluzimudewunuf.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607604717e097---sonalurevaminuviro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=map+projection+methods+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c2bd68880c42f1cf06d12a3e44ba6c09/86179546911.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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10964 bytes
SHA-256: 9f3f30bc65f96110d44e5f6c87f3512612af59639db9b83cc8f2d2f9bff6566a
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 20472 bytes
SHA-256: ecae0ea082e57e238aa485de0b52e588b9636d2c5fcccd316889c448e33fb58a
font_02_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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