Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd23b0e917ebeaad…

MALICIOUS

PDF

110.8 KB Created: 2021-07-08 06:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f89a7c8e1a3d4ee1bc0e35e58c3e0811 SHA-1: 0516395ec2a1450a65ce25807aa45f959d01073b SHA-256: cd23b0e917ebeaad0617d744321f384c76d49d85c5646e5455ac34daa221b732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, likely to distribute further malware or phishing content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to exploit vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b0d34ecd587a504bc227a9e572a519ee/mebojuw.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9451b6b1---sadigibuxaki.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f53bcde374fc87acaea3045f0a39670d/jakezolekobarudemuj.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/imnp2nv3fb5e97089422p967m9/dukanidisido.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efddb07ef2---6090840000.pdf
    • http://centralgiving.com/media/userfiles/file/wejugowa.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/gozujugumata.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/xodag.pdf
    • https://invest.pl/userfiles/file/23121252417.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021531519429607.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bc27ac52---maxagizizevurirego.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9be086e968df87f86336518ec89d77f3/2998272962.pdf
    • https://agermag.ro/mm/file/9994032410.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a594b715a53---57288274111.pdf
    • http://sklepjola.pl/userfiles/file/17874546612.pdf
    • http://montagnobozzone.it/userfiles/files/1316794692.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099261755b45---tadamuvujobosuvapuzopokar.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8848c42cbfbd6d10c0963cdc86040e0/sudufuv.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822324941b8---13663249812.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d45fa9843---71203593310.pdf
    • http://kingalbertltd.com/uploadedfiles/file/mewomosukijejokize.pdf
    • http://russkiivopros.com/images/FCKeditor/file/75805095245.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=types+of+oboes
    • 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_off00013f9e.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 1692 bytes
font_01_sfnt_off000147a2.bin
070326d7d3771e68581d358c328f918c22409849ffa6c66af6eaccda96875c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x147A2 22984 bytes
font_02_sfnt_off00017fa2.bin
d34c49bb01333b0af2cdb1b99839dbe25cd00cb602881bcf9ad988e5b90fe3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA2 9968 bytes
font_03_sfnt_off000195a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x195A4 16792 bytes