Malicious PDF — malware analysis report

Static analysis result for SHA-256 e895bc51d074125a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 08:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af57f7568bff0100ccf8508cc7ccac8f SHA-1: c4144bc553d0df7931052ee2a83b1166678c7f07 SHA-256: e895bc51d074125acff2188492ec8a81f82e7e92c5417ff2b1b45226f46972b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The primary purpose seems to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/86e406504e129a413a1a6759b7f922c6/wavebipanozila.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad334bffb2---27380122651.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f0d57a5e14e8cd0e7f037c9f1196de6f/77645389942.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/1500773361.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62212160994.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/73995192830.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/68203565502.pdfIn PDF document text
    • http://renovator.cz/files/file/61549544852.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5816b81df7990875d9915a9eab01267f/17562290892.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98decd3217---basuluruvikoza.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/nevunafesax.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fezebuzazukiwukeke.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/71457557010.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/59038937662.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755aeca23dc---21184911737.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/vojij.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/11417a1b7bc75260961ce06b2c9c7c9c/89518144280.pdfIn PDF document text
    • https://seikico.net/img-tym/files/julebaka.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/19871245250.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/23a150a6b239d1dd8c24c2f8a85893d1/81401299423.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430ff2503d---joxebexurosapaginebufuxit.pdfIn PDF document text
    • https://aashianarealty.com/file/98319205992.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ce0771f4---zisibipimulazuwulewubik.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/sabexono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manual+word+meaning+in+urduPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 10504 bytes
SHA-256: 508918c18ea9f7a9a682334a0a9445c1de10b0cd39f1bfa70f4c13ffbd045c3b
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16860 bytes
SHA-256: 2f7fd9bc788d9f5492c96344b7c7df5f792541dd882496445a90fcec3c9fe7a5

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