Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39616f87066c1a5…

MALICIOUS

PDF

84.1 KB Created: 2021-06-12 14:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5b1769416947d6ed0f89bd373734a505 SHA-1: 4fc0c72aa4ef6b8169ed4e4ccd2227e36ae9a363 SHA-256: b39616f87066c1a581d3951af7adf7c855348820ae406d469a99ca4a1d321cb0
156 Risk Score

Malware Insights

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

The PDF document contains a lure promising free movie downloads, which is a common tactic for phishing or malware distribution. It embeds numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://queure.ru/uplcv?utm_term=telugu+2020+movies+free+download+mp4+avi+3gp PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/487add270c38417b964e2a72833e34b2/34467585019.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/22698896019.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/89d67a10be85c95c544c08f607444e34/netipubid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d5469ea8---31370906748.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b9f50534---65438471333.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823a458ba9a---jovilajunebixorul.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rgv4kgr2a4banlhp8eknfo7j61/41059377604.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/57896836419.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7076def1c4---mobaranumas.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/62bd42b4a921e468a57291646920a0f1/14292082915.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2743ce6c71218b39b4ab4fb458247859/32686832133.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/68437449897.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/49187567394.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bo5pmjet401od4igmodvtlu22m/litiw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608044146e0a0---98258173302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • 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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5988 bytes
SHA-256: cd8c3aaaebe42d599948e7aba1b8c7b1aa0869d749d3782e8c9fe1df3666c579
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 11096 bytes
SHA-256: 88bf328eecb0168c3da78d2deb7c2ea6908bcd7678269d69dc2f5b84046881f9
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3