Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d61abc0208c99cb…

MALICIOUS

PDF

162.7 KB Created: 2021-06-11 02:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aeb47cbc29dd2938f862e1f6477ac34f SHA-1: 33397fcea57400bfa3b257e558586d4f5ccbfccb SHA-256: 3d61abc0208c99cb178289a415ca6c4253da236888ac42768695f71b41c243a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress upload directories and disposable hosting, disguised as content related to 'Attack on Titan'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

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://catamma.ru/uplcv?utm_term=attack+on+titan+season+3+part+2+eng+dub PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97803285c---48376698461.pdfIn PDF document text
    • http://biosite.ru/images/news/file/96279064111.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772765138a4---59332037965.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/vumoxabiwisavafemuk.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084288e353e6---vumaxi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082abcf184ec---40080687492.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db85fd6b29a7e11ecc2e56dc13063a8b/53719451968.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0304b8ade---36991741906.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc264951a---nozijedoxelafuratisudip.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4tap798ct5fodte76ftbit41m0/rewabutetajizoban.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6b303183ee79b291b1820fbf0016f14b/94758202415.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/88d87878446ebf4779fcc77f55ef3057/56028742755.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/297fb083752adcdd05dc4f026ca5b3e1/gofupifokum.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/jonodajo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3c384a79---kesekitokujenebov.pdfIn PDF document text
    • https://asi-filter.pl/files/file/karedi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408dab60d---80010791263.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cce3a815---8208791318.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96903d284---wezuxinusojibufo.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00026847.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26847 13280 bytes
SHA-256: eda9e677fb2d3b7c9efcb460893429046657c6f271a13e3e8bc16e4850fe7b4c
font_00_sfnt_off00017d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D79 70864 bytes
SHA-256: 75cd162c662df4f5f4129461989db589fcefaa933fdb47f48440aeea550ee09f
font_01_sfnt_off000254e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254E0 5696 bytes
SHA-256: baee41f47e9a7993fea75ac8f8b885c0f7582d4592acf1dab5de75e5a29c3ae6