Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b89786bec8e1539…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 03:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15c976e6467f1e1c4a753b9c545e5bbd SHA-1: d2120a693f47a274a488fac4046e3bb6b7bd65b7 SHA-256: 3b89786bec8e1539e7d8c525cdd707e3d144435b40a2ea8bee96c09ebb17d5f4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6616

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://teamtrinity.net/trinitya/file/98269286742.pdf In PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/wizepupibetituta.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306edabfabe---36689832473.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/83179307555.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8p6733gvdkg7ofeun3n0kfukc5/wodoviz.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wuboxekuridujimagulizug.pdfIn PDF document text
    • https://negaratoto.com/contents/files/jozukuvoxa.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lozimuxiwefimewamimat.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/saworibinotejokap.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/41181753376.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/wojelezowugononeref.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/69749750484.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/relifekanuzuzusid.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/jewozofowudiligixegaju.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zilogubarex.pdfIn PDF document text
    • http://ijfbn.com/editor_up/gasofedozalamowe.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nojelalakumijape.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137442563170---30705387486.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/fabigobezejuzas.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jikemojisabopimojuzenija.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/25200360483.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lizelar.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/22500010612.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/35650633110.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/75677391444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+root+my+phonePDF 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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17472 bytes
SHA-256: 328f2061f6e349e25d7a4b876fe65c6cb402497d5ae6dfff3395e4bb862d3223

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