Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdba1db7fca2f83e…

MALICIOUS

PDF

81.5 KB Created: 2021-07-03 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71e6569c090ceac2c253233dbc907a7c SHA-1: 2b2370ee544c28c267c765c52658689bbac1dc34 SHA-256: bdba1db7fca2f83ed6e8b0b7f9fc6513efe116fc5e3b59125468aab73b4b4b14
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/14eb1c679444602c0dd870fa4c3a588f/polavinofiveloje.pdf
    • http://alumcity.ru/userfiles/file/penupololido.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/67bb73fd43dd9bd4d93c88d44ba6f278/9265153612.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6938f363ee3fc8d976c564c3c1edf49/73328002113.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1dde0ba8fb64d4dcb9efad7067d6cfa5/38039114718.pdf
    • http://forter.vn/hinhanh/file/bafijekaze.pdf
    • http://littlepearlbooks.in/data/eimages/file/vojugirilinuvexinipi.pdf
    • http://wittlich-luexem.de/userfiles/file/lobajiluxutaxe.pdf
    • http://andrelandberg.com/userfiles/file/zavigixojereriluguref.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/74637892917.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aedd14683---82086291402.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ea6624da70a237313fd3a8a63b3d44d0/87652024683.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9338d39cc7729824decc3c4816f82bf4/2940138100.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b02b1099f---polerowiwuzomegejo.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad3e1a636---zupubefereluvoriju.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2v130feie6anomumon7mnnj25h/66065184261.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/6292075002.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a45b4ec6---20670242681.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e27c2152eb1f80e0cc2e57d2c1f93774/80763605979.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65364f8f---6686715598.pdf
    • http://brandnewgoods.net/userfiles/file/38863260060.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/86c62bf18c84b88d980002a92236cce7/rejikononebuwinagewewuwuk.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/kedepagipixatesezi.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bdtamtbmeljma54mhjd7jr3j34/12835755093.pdf
    • http://amtutoring.com/clients/865321/File/86232489722.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=central+angles+and+arcs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin
42de92990592a8e046edcc817e7b3e61f524a81ae1ac69fc536b5ced64ac4a07
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 17924 bytes
font_01_sfnt_off00010933.bin
10809572f3159c989a7a6f6c193d10c927565ae4f3baba56faec39b4cd3f4c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 10364 bytes
font_02_sfnt_off00012099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16792 bytes