Malicious PDF — malware analysis report

Static analysis result for SHA-256 e778db875e2c03fe…

MALICIOUS

PDF

115.4 KB Created: 2021-07-23 19:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baa6f605ae7305df901043e1d340f33b SHA-1: b41a8da7e590309f706c25c241026c3010769894 SHA-256: e778db875e2c03fe5228f652648ad11aec42e83c6bb7d786d9c0dbba6f152802
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of hiding malicious content within password-protected archives, which this PDF may be intended to facilitate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbde29f270---16407234818.pdf
    • http://madveras.com/ckfinder/userfiles/files/64124789282.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/fb5bb99267f4705d0065ff739fbfe5d0/45820091380.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i6lqeeldl2j3atd9ec7t0ouat7/21957706376.pdf
    • http://ilovehikari.com/uploads/files/fabemitegamivazubemog.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc5787e2d---71745091333.pdf
    • https://reparation-mobile.net/userfiles/file/48857484712.pdf
    • http://finpacecuador.com/userfiles/file/fovokutusexafokaretex.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/92131309524.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kt0urcsndja2hi9bne7ljnu2f4/12677166993.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/zilejixugixovav.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6e65bd1da---90151063449.pdf
    • http://cokhisah.com/webroot/img/files/madedotaginifumoris.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d550e4238---82498526602.pdf
    • http://rocb-ap.org/file_media/file_image/file/57561217276.pdf
    • https://media-get.com/userfiles/files/64849412007.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78af6c748---gabibawimokoko.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9b8cc9dc43aa2a580982d996fb28ead4/lufazuw.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a60ca6ad---39084480995.pdf
    • http://auto-spec.ca/fck/file/sekupobovogo.pdf
    • http://auchli-appenzeller.ch/userfiles/files/jovobor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ver+las+cr%C3%B3nicas+de+narnia+1+pelicula+completa+en+espa%C3%B1ol+latino
    • 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_off00015b19.bin
f1bf7d25730d5c537506b88c1a1d363043d6b9e580fbcae4a5b4f054e0f34652
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 11140 bytes
font_01_sfnt_off000174a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x174A7 16792 bytes
font_02_sfnt_off00018cb9.bin
e01d46f8dfcb2555dc342415290cad673f2f1d27215b24bb3943c718f3b2f529
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB9 18596 bytes