Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f492905f2117654…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 21:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91692f46a64c44ef9c74ba5ddec952e5 SHA-1: ab1f43e87ef802311d0286a77dd2d1d7cdf26eaa SHA-256: 9f492905f2117654b973e12f06858a22730d9b22b4db7ee2ba27d83e88586a77
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely to lure users into downloading further malware or divulging sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba339ecea88---jodozavumakalufubumak.pdf In PDF document text
    • http://kayamedbursa.com/userfiles/file/kovulezumatiguzeruwigogop.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/13404303412.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/60228565212.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608186735b7df---zopibidanizibukipaboj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a79813b1c52---zorip.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/36571592858.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fe562964---44805552930.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/1315682382.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16074a18511836---49242659066.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jetofibifalonitoj.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ubj9jrotaqr619mvo999373sa1/zogazijutasofugewepepudab.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bbc2ca15e97ef592ac0d671fa5282fef/9768015126.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590b63fcba---36185235587.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0e1b23569d81b19876437c05c7c4502a/fevafogidumoridaxodixup.pdfIn PDF document text
    • https://baongochoa.com/upload/file/vibagobakala.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bde7527a9---64567942761.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/85284492514.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160825c46188b4---49789247390.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/detatenodugibo.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/29348810350.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04b6b173f---98846296693.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/82326218580.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce52314e57---55027776617.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d464c5d7cf---viwupogugus.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jaladijetikefepovegerisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+map+minecraft+pe+downloadPDF 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
stream_004_off000105f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105F9 19548 bytes
SHA-256: bc87f4786ef5247cbb2ddc620184765558066ea10ba03dfdb08ebdc44b6d2d25
font_00_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 11132 bytes
SHA-256: 487a62b3a31882516cbdc594474ce7a041bc630428fe15398b1cfbb3f1a2c327
font_03_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 27772 bytes
SHA-256: 27a16573989e506b5518d1051a240b855da01c8ef318a143ca5920fe3407e5c7

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