Malicious PDF — malware analysis report

Static analysis result for SHA-256 5339457fe1c2a124…

MALICIOUS

PDF

49.9 KB Created: 2021-09-07 17:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66b490be6e4cbd81eecaa44c05a6d518 SHA-1: d513afcb8fd40480d66cdeb4320dccab6a3e733d SHA-256: 5339457fe1c2a1243f99a57ecd398bc71218fbb51b35b8a28323b1290b7e318e
154 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some hosted on compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5725

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://skpizzasubs.com/uploads/files/sitosekirirabikutexaxi.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4011c6c43---75330670970.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/manafasazoxopetepaleri.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/88495686631.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/koxoserogi.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/kirexuvelajafelotaga.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/4c95417044f86edef908788c23f9e3f1/kapemozedekizeterenola.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfee25895---1596042010.pdfIn PDF document text
    • https://arerp.kr/data/file///kejurokopimomukivefufizeg.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/tikotigepuzajuguvif.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b715270f3---98107690375.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/12bc00556bcf1a4fab2b77ef4270f3aa/6709848960.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160782ec481cfe---kuzivilavivizidapavo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nhqq873fua4946nqd2guckn283/15042559897.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160913ba97c964---wukuvos.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m6drf95ag1o4h0p91s8kn62bh7/zinosuzuzeferunine.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gupolonewizugopirejo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1116675d---welatibasurixosofiziv.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/nelirajiwewa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611445ccdae03---gerajoju.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161062655d2748---84352555942.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c5826a525e030d5c46394f33149e9455/35650394778.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086efc61aa1d---milefimofe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fb82d5d5c---83506197491.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/60076209239.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/40797473287.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46178eaa3---nawurojulomovazapute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=organs+of+the+respiratory+system+worksheetPDF link annotation