Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44bc73c019a91f9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 601efaa1219fa2f6e0f299f4ee68100c SHA-1: cd6cf9ef900d710a5f2275dcaa418de7d8c92712 SHA-256: c44bc73c019a91f924a96eb32a8bd999ae42bb7d87eee1a97a3729b57d493265
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, many of which point to compromised WordPress upload directories or disposable hosting. This structure is characteristic of a link farm, often used to obscure the true destination of malicious redirects or to host phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier clean score 0.2039

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://a2designbg.com/userfiles/file/kukemikonobuwekinajap.pdf In PDF document text
    • https://bajrahrs.com/userfiles/file/85545074260.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d7830562---dazisinabigomixerabemaroz.pdfIn PDF document text
    • https://semut73.com/contents//files/lutibarulirujozuleruwuzi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/55076721563.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608798fab65a2---dururedose.pdfIn PDF document text
    • http://djpress.pl/Image/files/ziwidud.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/7273581876.pdfIn PDF document text
    • http://gotween.com/userfiles/file///22016590276.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/50af949c3616e450b611d836412a3ddf/79426658010.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/58167337917.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/52790629593.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088654495359---xosewobosajebemazijo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/2153515417.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb2eb5c9c---86300606294.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/megiwadefop.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/xutezufaredo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608872723e304---xezizobamok.pdfIn PDF document text
    • http://edgecs.net/documents/nujonixixekesomezoru.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/41074278106.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jewapejebib.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/62998482348.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/29135804097.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160941f137c1df---66302183250.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/geusosbh5tqaopf2mqrieegjp5/93284467912.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/50122d86f1a738c9efb1c23f01e6a01f/goxexixuxakoremisigewe.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210603000309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reboot+and+select+proper+boot+devicePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 19384 bytes
SHA-256: 0cae8314c5d1fa7339b88c46ce5c18f50a5500faf73f00c3f570487b1b795ee9
font_01_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 10756 bytes
SHA-256: 4b30f4b49f037d14281314f5652d9cb8f00596067e6178e534a05abf725cb684