Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3f6efb1f44c1f8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 13:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: adad3103e945c4e9f8d1d09b99deb304 SHA-1: 7c66b70cdabf7344004bf3cfbad5fe0d65712dff SHA-256: bc3f6efb1f44c1f8c014fcd07fa1714b18864f796f0b28b5ff66edfd77de9955
124 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

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 https://drafthe.ru/uplcv?utm_term=playboy+2021+pdf PDF link annotation
    • https://fidelishospice.com/ckfinder/userfiles/files/31201689518.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/18988794274.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/52776506010.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/dusobumo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/teregupiwon.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/77976735789.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/kuvowuxip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fe52eb83---1048409532.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/lujogaloxebikoretare.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sosobujilimemidaseta.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/ninuneramowepom.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/25024816365.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/24411069428.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xaxed.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/dozezamixobafuwabexetigaf.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wijil.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/m7kh6ggihil8vu93t3r6kb7r31/80157826739.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/50211398957.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/83888836786.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/51510034446.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc8a9a5c3---midim.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/57357313256.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/zeruvowilugoronimuvon.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nesagominijugigufuwilabej.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147420e6add0---pamopixadirijege.pdfIn PDF document text
    • 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_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10348 bytes
SHA-256: 2e38bc696c72f81a5d07f9cee611fec7683fef5e355dc1c2446ef456ea3a80bd
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1