Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ac1aa1fd8eb9f0…

MALICIOUS

PDF

66.5 KB Created: 2021-09-28 21:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0105915a8121f88215a55e0330fcd78 SHA-1: 401808a077214ab16fd89249b302233ce5293933 SHA-256: 46ac1aa1fd8eb9f02612be363d4e53fa6817be9fbfee52bc2298d8ce09f66ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, but the presence of numerous links suggests a redirection or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e1835919a3f4f3eb484031d4c8dd8309/rifilifikelulefodaka.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7eb0d614e---nejosopezenige.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/19388060121.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0qu3e48d5pcue0bno678qhih5s/16851954099.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/54167361478.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/lazejarigor.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/mojozenopegajafasibe.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/nuboxenul.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/25743186172.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/40996895406.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/65877560642.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/73179893607.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pizoriderenusowe.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/watisixiwexowadut.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7e80d2da1---sevomiwanukoviram.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/44944130393.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bb5550983---jowosopifufekovi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109170110253441.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/46723911753.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/34170158181.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/gugimikufozigoneki.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/lalobokeviwuke.pdfIn PDF document text
    • http://termocity.by/pics/files/mugik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+bass+boost+app+for+androidPDF link annotation
    • 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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 15748 bytes
SHA-256: 235cb7ea61478e97083dbe65daa82830a799e44b22be67f30bc35f4c42151f49
font_02_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10636 bytes
SHA-256: 189d4b71b7a780e15121f7afaa00ee395d0eb8bd3cdf39a6614c1b412c59f5c6