Malicious PDF — malware analysis report

Static analysis result for SHA-256 248a4235f3bc2483…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14db852058b6c4c31da56a1d5e1ac096 SHA-1: 5a7e54000937bb1c581f08f32d5b9ee1fcdef04b SHA-256: 248a4235f3bc24834670bba497da457c5469b24836f430e1434ae90c8fbae2da
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6921

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 https://bazab.ru/ckfinder/userfiles/files/42204264547.pdf In PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/58992405432.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c608c607f96---nefejewavebived.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/bifomisazasufa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1ebea4366e281d1ed8378f752f619797/vikez.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8071608e29e8300f3b800e23cfb0f65b/moxawutosuf.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/zemal.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d1a416e54d46d862d36dea760010da2f/wopusofovamukunojivubimi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/80963705307.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mukasumovijekud.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/36759905296.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5t0dnp7gouc2ck7q5tehhkp0fj/gemobijadupatazikiseko.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a60c287e---83708445870.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/39556987305.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3v241gp4mnr7td4leracvcdr52/xopisuteni.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/kipikeze.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/9643626502.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/df56faa45b8f17b64fb455cc6a465fde/pekumibamalobejoz.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/tanarugim.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/84bcqr9iebgd8d9jctf63trjqs/96858485267.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/demubemet.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/73355288238.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a131d50a---60913244393.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ecfc4cfef---39468467067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tnpsc+group+1+prelims+books+pdfPDF 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_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1