Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13bf74aec07f2c4…

MALICIOUS

PDF

63.7 KB Created: 2021-09-02 10:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef6a71465dae72cbc03fde1f1db0e321 SHA-1: 781520058c702b58afc69dfecf10490c9b4fec1f SHA-256: e13bf74aec07f2c43a771f0656fa10b565779b6c4018756d0783632158e153e4
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload URLs points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9351

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da58933d2---xuronazim.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c797d7f955---34274984237.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/88197217983.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/kevix.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/35490040397.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/56ev9u1iiql5ed1vb6fg8vttf3/vumexitogonemep.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/89ba2854edbc635f8035f49f5086b676/22756339090.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/11658844849.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lasopo.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39333844134.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • https://samowar.me/userfiles/files/kevebosaxafodufenitanofo.pdfIn PDF document text
    • https://questyme.com/userfiles/file/14945397496.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb126755e1---28077851199.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o37m3ivr1ij9k3s13invfcvmee/talulegonefakuzut.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efbe70941---lapija.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa8d4808---58747549483.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab679526e---sizakurewatikagijeb.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/025fdc93d5e8185bf6b1f71729219cce/fesaxepodinu.pdfIn PDF document text
    • http://elsped.hu/files/file/96121818948.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b6b6fa38ec5b3d115a21fda84cc226fd/92111354661.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/17825391157.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905dc2efd7d---fipelebinuvo.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/16a294d156d2750fc7fefc1f184cdbc4/nidelasev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pitch+perfect+3+watch+online+123PDF 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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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