Malicious PDF — malware analysis report

Static analysis result for SHA-256 669f116cd43b19f5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b676844e109db9a93d5ed511b3085a90 SHA-1: faf7e6c38617eddc9953936f220c72b2015e298b SHA-256: 669f116cd43b19f56de57cecdcc9c0f02178d1506e6f93411e191d468dbdf374
124 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable or compromised domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The file's structure and the nature of the URLs suggest it is intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pipivujuxuzasikakot.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/wamikega.pdfIn PDF document text
    • http://packamate.com/userfiles/wededonusutoramotep.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/jefogezuwuripesorimo.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021941751503809.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zimemokaturenosovibadedi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb499dff84---19595458662.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/lejaguduxazukowir.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/66997851353.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8540958204.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/573218486.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210907_153259.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26989090742.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613171da28f01---11210894720.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/risetufowumetokel.pdfIn PDF document text
    • http://hiniceshine.com/upload/guxuxerekowesenigadizof.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/30216439967.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/67936269664.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/bimomixibaxepujefa.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/roriwudewalaxizadoterezi.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/96566417574.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b81b44a4---vawosete.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gisijomefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=trade+off+theory+capital+structure+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10792 bytes
SHA-256: d924f5ab471302c46a4f89113e31e840d13695e656d57ed4dcbfadf2e2034403
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 18064 bytes
SHA-256: 59658825300b53ad54dae14b27158dbe652fd922db441ba12601435b95a84ebb