Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0b1731e3af8bb1…

MALICIOUS

PDF

59.6 KB Created: 2021-09-01 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9218529ee841f90650cb0f4c5311fc4f SHA-1: c7e239ff126617fab814b405f9ae4ac417f8249d SHA-256: 2a0b1731e3af8bb1c1dc1a9d932b48fab82ac3aa8bf6f2dfb4df85081a4f8579
154 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

Heuristics 5

  • 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
  • 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://madurastones.com/userfiles/file/domadofugoxejof.pdf In PDF document text
    • http://shesob.com/file/files/rujukem.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/33737478601.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccaa71437---34111504511.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/46955656902.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/22409893559.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30256973090.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/04a760d09cd106b056b6b69a287dcf09/muvimof.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/61287158004.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/janutekegudogilerinebax.pdfIn PDF document text
    • http://perksys.com/userfiles/file/33378255059.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9i8e1qll464mbipplb1nl1mqb6/15536895472.pdfIn PDF document text
    • https://ksboutlet.com/file/files/93466931311.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/97740459341.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/22095956441.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210821_1866DD4CB642D930.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9efa938d6ef687c6f8e218e93ceb6b2a/1108213790.pdfIn PDF document text
    • http://elitvorota.ru/f/file/62446043206.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/95628394499.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd62aa0562---vituxevukukir.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/fuxonazefitujalezudiweleb.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d0ug6mdu2a06if7kmitps5e9ha/lowoneno.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/texej.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bafapetalolofemimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=square+root+exercises+with+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 10788 bytes
SHA-256: 1cc1dd0167fa1e72df9d0189822abf08fd575f0b5e78b77945ad48f3c50ee22b

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