Malicious PDF — malware analysis report

Static analysis result for SHA-256 8197488bcf8d8424…

MALICIOUS

PDF

94.2 KB Created: 2021-07-21 04:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0133db4f5bb3ed7834d8628eb5c771bc SHA-1: ef80f4beda70248604ab479d7b675704ca0a3dc9 SHA-256: 8197488bcf8d8424cce9e876caa49f7de3a4b368745da113e4e57932938c1f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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
  • 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://ijpdua.com/contents//files/97091663031.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/nonegozivusinorapuwisemi.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e49b71c6---12435490066.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/di2l7h07mfj1q552k7bb238bst/saposubaw.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pr89vimjiu6fmp1cbo78ta34r2/gimugutadona.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e82874a53---pelujodijeta.pdf
    • http://akkoryazilim.com/userfiles/file/24214859283.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lnhjq81fnjdquqdg0rcfhcdsdf/61292935485.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sonipijidoz.pdf
    • http://arcomproltd.com/userfiles/file/12382998116.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074124cabbce---lofese.pdf
    • http://katachizu.com/img/news/files/xerikapobumaliximiti.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/egmnetqoes39eiura52ip3k0s6/diwufifemumivo.pdf
    • https://rlmahtani.com/userfiles/files/23779053008.pdf
    • http://bulgankhangai.mn/userfiles/files/5433456669.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6k18ffrapp38h0smm3mf2ons0o/84918182237.pdf
    • http://www.hangmandigital.com/files/file/lawotaz.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/48420745bc2e5475d0b92864e63ad482/loganaxijenedigota.pdf
    • http://www.toptehnik.si/images/4376147089.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078126518122---kusodotosebirageto.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rsosencnn51r6e1n8qv8rf6d3b/37421497512.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20ab9779d---17325857029.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad69274084c---mamogagote.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=happy+birthday+to+you+in+korean
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e2.bin
bba8c67b4689baa8fecbe39dc877d8b9fe823081000d105c09aa353bbde2f40b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 18428 bytes
font_01_sfnt_off000118b6.bin
0e4efaf2abff2961908e81029af20921f5910ed3af5e2bb02c6dfd0ac2dbcc2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10712 bytes
font_02_sfnt_off000130f7.bin
e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 16128 bytes
font_03_sfnt_off0001464c.bin
c08ad356217f4917d395294ce6cd57b95f4b1c7ec502bccf66d00c8b236c393f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 2976 bytes
font_04_sfnt_off00015296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 16792 bytes