Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e3d62e53d9beb4…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 09:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23a1fd6b967af4fe9eb9e1a47619a935 SHA-1: 8d86660a03c719876add3959523f4a171a6e3ac4 SHA-256: 90e3d62e53d9beb45791cfe0bb875bd75e635fa513ddc5654f975a47b1678ca5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4gb3dkjdg22t4j5rev1t1uq7eg/75954228373.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bd36ae64---94442718831.pdf
    • https://daquin-ferriere.fr/userfiles/file/23813888972.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/da8514ac47cebf7834b42c68d6f737a8/80083829565.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210610/file/16233079216102.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6352a6040ca054ce60e7ccf49c900e96/31149927390.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c17556150---jolaxilujoravupel.pdf
    • http://ahlhy.com/uploads/file/281025085314.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/tomovozujulutivuno.pdf
    • https://aslimitada.com/userfiles/file/25679632101.pdf
    • http://romanakladatelstvi.cz/userfiles/file/57730568551.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde61837fa---vejurajined.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6815007afa16444427dff3dcde0000f5/lisaruzoro.pdf
    • https://rabudiagnostic.com/userfiles/files/48768608745.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/u06isfvl3cr765gmtsbai4msp7/28663242674.pdf
    • http://nuovartea.eu/userfiles/files/legujatewep.pdf
    • http://fonnepal.org/userfiles/file/85028752412.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/60fab39d8c99ced3b5472edb0b0dc1e3/xixedisiwe.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/34e75846fed3cfdcbc14a439da7d88cb/8903802615.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f3517237ae31f702c51fa7f3d764de7b/12922604174.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1loisg277p3rcfuho5onfrjtqs/viwirez.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b72248fcfdc0771cde4ed6aa010d6ab/91185698638.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+started+stuttering+out+of+nowhere
    • 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_off0000e76d.bin
b1e38cc9cb46809c3e9098be067aef6de806f62206ba21f3f1094e247cc9ebd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 17292 bytes
font_01_sfnt_off00011466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 16792 bytes
font_02_sfnt_off00012c7d.bin
ac145e7020da85dd8150ef9c6b2c66b16c9eba36a242e358c053d962ba0e08cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 10724 bytes