Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad12ada91aa6ad3…

MALICIOUS

PDF

71.6 KB Created: 2021-10-13 01:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7b5cd1f704a6403fac2c25770f0e18c SHA-1: e8099441d758bda0607a53e3f76e8125f12a2d29 SHA-256: dad12ada91aa6ad3accc5a8e60c5e923b7478231eb82bae4acfcb92d38838def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many external URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users or obfuscate malicious destinations, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing attachment (T1566.001) given the document's nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://konemara.hu/userfiles/file/jovupunem.pdf
    • http://talesma.com/E/file/43387857729.pdf
    • http://rosabaum.de/web/editor/files/72171133905.pdf
    • https://alamansyria.com/userfiles/file/kibetotulesikotazawof.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/57958100806.pdf
    • https://termoformat.md/img/files/vikudesikapojumuk.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/37760714683.pdf
    • http://abpaluso.com/upload/file/vipumezelebolufezutofaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614698b58bbc2---bewututagal.pdf
    • http://slstudio.it/userfiles/files/mofixirivolorufumas.pdf
    • https://erdenetpost.mn/userfiles/files/lozekol.pdf
    • https://xebecdesign.com/xebec/userfiles/file/31163399954.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/33075263928.pdf
    • http://brickform.cz/obrazky/files/wafijeginokasexoraj.pdf
    • http://huseyindurmuslar.com/images_upload/files/39967468320.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc19c3008---95832286648.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a602fb5a---xovakukami.pdf
    • https://art4you.sk/editor_uploads/system/files/suniwuvoduniduzib.pdf
    • https://candica.pl/ckfinder/userfiles/files/voxemixapinagowexisizap.pdf
    • http://inbeeldt.nl/userfiles/file/mapokobonudabanasanirewu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161594b01cc495---53865402496.pdf
    • http://zzfcw.com/file/fkimg/file/nipozifaperanopenubazig.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146562c9c657---javedotixen.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a0c549cc---pobunigojonenoxev.pdf
    • http://buyo-g.net/userfiles/file/limobovevimefopunogasora.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=spelling+dictionary+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b669.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 16792 bytes
font_01_sfnt_off0000ce80.bin
42735628e3ad154f656a14b03d4c8a51d8682c0615be746b56219d25baba20cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 10712 bytes
font_02_sfnt_off0000e703.bin
1b1ac9b83ccfda36db42a4f4e365d873c90e353a384d468d6d919a46fc9485fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 16392 bytes