Malicious PDF — malware analysis report

Static analysis result for SHA-256 885b7169d287da40…

MALICIOUS

PDF

90.5 KB Created: 2021-09-23 20:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33fcfab4366b4b1cbbc7b2f791269831 SHA-1: 48ef245917872b72c39fd44e6cafafc48475a1de SHA-256: 885b7169d287da40bcb4745e3d50bd291577332d42cc8cfd16c2ce051e6e23c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host files within 'formcraft/file-upload' directories, suggesting a common upload vulnerability exploitation. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then protected by a password provided within the document itself. This is a common tactic to bypass gateway security scanning. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161396adc870b5---kofuxuvi.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/91674701207.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0e4f119---kukemarolamoruguvufizidex.pdf
    • https://cissud.eu/uploads/ck_editor/files/somoranipan.pdf
    • http://zechnerbau.at/images/content/files/95537666141.pdf
    • http://kmbb.at/userfiles/file/51668526850.pdf
    • https://foulardfotografando.it/file/93777663771.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/56726580733.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141afb29d520---getitepegi.pdf
    • http://tubesealer.com/uploaded/file/1901833606613061394e87d.pdf
    • http://kleni.cz/userfiles/file/mixevozavalixoda.pdf
    • https://dialogueinpraxis.net/files/docs/bikezebolexujekasuzarusaj.pdf
    • http://cuacuongiare.vn/upload/files/50789681234.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gometano.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/178a27bf5fd3638b8e58c2b9dc508ce4/12020259091.pdf
    • http://lafiestadelmoto.cz/files/file/wasidefalupezomoku.pdf
    • http://backkwang.com/userData/board/file/8299508966.pdf
    • http://decaiyun.com/upload/file/210915201426815395ilvcttcln15e.pdf
    • http://crosswaysrecruitment.com/userfiles/file/gisawejew.pdf
    • http://hockjoohin.com/admin/uploads/file/duwodovojosefikemiroboraw.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/bowomaxujafamo.pdf
    • https://maconlux.lu/userfiles/files/fixulilizubolifilonam.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/52639321815.pdf
    • http://aligokdemir.com/resimler/files/89227391388.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=eliminar+publicidad+android+root
    • 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_off0000fb3f.bin
c1b3c1a34f47f13754425e4484097f7ed3c17c90b6afd9f463525994f3a86da9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 19100 bytes
font_01_sfnt_off00012c1d.bin
59ea817fc455e03a0eb9c771c46d2558eeb42364109600ac5728c8e5742d9625
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 10600 bytes
font_02_sfnt_off000143f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F5 16792 bytes