Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd85cda54bd07464…

MALICIOUS

PDF

108.0 KB Created: 2021-07-24 18:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e429dfccd943c214d78d9c2e9dabfc65 SHA-1: 83871c943ed301799bde52552e9879ef89e3130a SHA-256: bd85cda54bd074640089e4e43b2ccca86afa852d39e9218c4f0d501f3e5d2352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xomufiwosotetedokijiwo.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/0d64b3af567a96c1b96980d997cb52dd/wapolazapi.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ba0083a92a5efd3e216b796e2b537ce5/89390613496.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/92135214440.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8bb48d39d63941ebc58140641e4a2b35/33835569822.pdf
    • http://poetische-malerei.de/web/editor/files/2817385277.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/43b78fd187cce0b04ecd5f41f5d16777/1526970263.pdf
    • http://ouhkpthaa.org/userfiles/68972888961.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_0F0C29484C438C72.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f36241749---pupidobidadinan.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3625a11219---famige.pdf
    • http://agnieszkapawlik.com/userfiles/file/zuwejupub.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/nepebemubafufukomewirab.pdf
    • http://gd-weimi.com/upfolder/e/files/20210604124359.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/40bfb356345c634cfaf2e886c8cdf777/25455935788.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f8c5roo5113ua3lqprl3ai44e5/85272846006.pdf
    • http://kalikraft.com/images/file/nazelek.pdf
    • http://joltiy.ru/uploads/files/90734689035.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/63iu27mubnuaaci78lfcn0mjl6/wojapi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=when+does+percy+jackson+and+the+stolen+chariot+take+place
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013183.bin
72ff7e72ab57330e7628c7b884707c4e123240363e359a475a366491f7ef3870
pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 20344 bytes
font_01_sfnt_off000166ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166AE 16792 bytes
font_02_sfnt_off00017ec5.bin
f03d14011cb695d9b71cd0aa084160ebdf7ec4f71f7f28e14eb6c8767e1f51fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC5 10940 bytes
font_03_sfnt_off0001980b.bin
d9a92404c4e717d40f9803eb9d970125c255ccd11dc1394b43f9980e307198df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1980B 1920 bytes