Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0449c018eac0ed…

MALICIOUS

PDF

63.7 KB Created: 2021-09-09 04:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4879dd37c8b67cb0304d31090ec50be SHA-1: 13eeb73f1f88f2b9a0e0cfb99f1b598901d86c3d SHA-256: dc0449c018eac0edff0e746ec7d915ff0116cdce77350b30de8f5e973ad5cc6b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of multiple external URIs, including those pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the final destination and potentially distribute malware or phish for credentials. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7787

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cortopolis.ar/userfiles/file/36243564986.pdf In PDF document text
    • https://hkpefa.org/editor_upload/file/92776040743.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/tizisarow.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380088f0018---91415177921.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9f253c---48161592657.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/witegikilaxarajozamugono.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vetotexumamojukulomin.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/xirosukubumaxobeza.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/tidoregogekozodo.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/raberejejebajivitijome.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d0c04b0b295f7fc3fdbab52521268bc7/tububiwuwovojofewamid.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/pidezaji.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43639242408.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135927831386---nabinesefal.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/figenifevobexeperigupazo.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/dinuzemagedom.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/70297053467.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/22433548863.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/vupidaziduzosur.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613061a9a8d29---68197647991.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/banopiwogululusexana.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/97858703087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+videoshow+mod+apk+no+watermarkPDF 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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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