Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ed3895a3ef63ce…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 03:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b0167c94eb42ff8c8d51eb4ced1d913f SHA-1: fdbd235f856ba235f3c5b5ce6dcbe4bcc4a609d3 SHA-256: 23ed3895a3ef63ce791526fbb44023acbc618f4794c87da26070a3bbff60546e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=can+you+search+airpods+by+serial+number PDF link annotation
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/om7q1kqsadl2svucvv90uva7m9/mivazesi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac269eda268---47586095605.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48545a3a9---48363207816.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5e85e47fc9d1f91378d10efc429b0252/xerofotebe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qimom813p0gp899bmsvac7l5u5/96679239865.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/99461522072.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/sopur.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/bilogademuru.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ee3ddd38---lomodigo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70ca632df0---mubejatob.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/03er1puvepfn1j3kueqh87sr0s/zabijiboruviziwu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/fajofoxagivebedivasesenug.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/sofesaxuvebalufo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940d70b9495---fazemuvivogu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/92910177287.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/64199761243.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/52220548580.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xasodad.pdfIn PDF document text
    • http://chromoink.com/updates/file/boxogoxines.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ro0pggmgrngqp1jmtsgrr6m76/wununupinafitenezoja.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90e23f0820---jekunide.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/dc0850a7ac183df6e6c547b68c0afa9e/90074830506.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 17168 bytes
SHA-256: 3c2bc8988e786d0180b2459a330bfee8e8956384448b54cb8527e28f532fd1c5
font_01_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 11064 bytes
SHA-256: 80c3629c51b327c238dbb261bcd5e0878682fb74e20f8fd670f835acbddc073c
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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