Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2013bb3dcf114a6…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 00:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 632955d755a19c4e7ae2423d36cd9888 SHA-1: 6079f6dffd832e1da9ffcc1827b1cba180fa4e0d SHA-256: a2013bb3dcf114a6511c9948aed8fe9657b42ae262e9004d65f8ac9f93ac6d89
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress installations, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of link farms and compromised CMS uploads points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=what+has+cities+but+no+houses+riddle
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/inn8ms1dictlgrlop9tj3jhsa6/forinabikebesogaxux.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0ddc9f92---folimuradofazotazafitoxob.pdf
    • http://henri-ruch.ch/doc_pub/file/juwaxijorakek.pdf
    • https://auto826.com/uploads/files/82819353129.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c078ba934d0abdbf306f28a915d91b7d/34457905711.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cef5e6897---59555085832.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0ccee98769c7357dba7f4d29d04e4d48/wavamurozixezexotudatig.pdf
    • http://codienlanhminhquang.com/upload/files/24584585841.pdf
    • https://pharma-tools.eu/galeria/file/fivogefuvenifemedumija.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ccbe1128---4842587502.pdf
    • http://aj-logistics.com/stock/userfiles/file/47271987678.pdf
    • http://urgentcarepb.net/userfiles/file/sewidebirijalo.pdf
    • http://eurekaelearning.com/upload/news/file/37969554102.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q4i2dmrj8g4db3raea7edef8nl/fuvibegakobibuxupimun.pdf
    • http://ciaooo.ru/uploades/userfiles/file/devosivokomin.pdf
    • http://cheumst.com/upload/fckeditor/file/muzupujexajuti.pdf
    • http://www.jindatunnel.com/up_files/file/82156852235.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ibmovc84sgqmoj0vcaihimb1vb/95139890392.pdf
    • https://badoza.net/userfiles/file/topipedalizurakusegixonaz.pdf
    • http://smepil.com/ckeditor/userfiles/files/71550787111.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bbfd7b25a---tiremofazoboge.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/vukunalewezujot.pdf
    • http://afghansolar.com/userfiles/file/vizinafukoze.pdf
    • 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_off0000f505.bin
45ee80d5c144dd1bda6bc49702c697a800a092f4cf4c84126d7b24bb7544ee12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10700 bytes
font_01_sfnt_off00010d8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 16792 bytes
font_02_sfnt_off0001259c.bin
2ae9067a9571abd536a15b8f7d3155b60dbf1d36581af195abd460909185393c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 17220 bytes