Malicious PDF — malware analysis report

Static analysis result for SHA-256 98be2d315ed22941…

MALICIOUS

PDF

65.3 KB Created: 2021-06-02 23:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2ef147aa179b7f840d4a48044ce549 SHA-1: d73e67e5f691992a070fc9c23898fab36576e6c3 SHA-256: 98be2d315ed22941dbc0f2e37c671176d0a1603919abd26a684729b863fc6166
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 5

  • 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
  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731dc291bfa---xabizonudepamagem.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9f603523af4aca9a3620367f5c8cd55a/46016031300.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vnhhvl1i2lrhk5123obbgird23/gapirutexuwaxomagazis.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k9elhhkioob12mqed7kuir850n/bedomoxubar.pdf
    • http://automsystem.com/UploadFile/file/20210502220248439.pdf
    • http://alimentosldm.com/userfiles/file/wixoru.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4bbce766---mikumutoduxizoruw.pdf
    • http://dhf-china.com/d/files/6931538279.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071652a97cc3---lilatevodibidixuxexof.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/39f7673119b4a367e1c2c1c8e5b7244f/59562111309.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b064dd9956f3e5a1c2074f04e92eae09/lutukibetazujejokozenuban.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2a7a9c4924583a585563406fafecc489/zomij.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u60lcf5gt8199o3lr0nq8rokc3/nawaxafefogopezatik.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0c94624f---99238187031.pdf
    • http://j-line.ca/fck_upload/file/ruwamexoxizokobekiwore.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707c95ee20---2445551745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=isobars+and+air+pressure+worksheet+answer+key
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin
a073f7984e7c6e997a705fa27941bd4b59afc494ca3fc4b64fac4eac29cf2598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5352 bytes

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