Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f0dfe607e0a5b8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 02:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be83919ac8e95f1abf28295568c2ef72 SHA-1: 2ff0e7dc1793957eb211dccaab0c7a63598fb747 SHA-256: e3f0dfe607e0a5b873e9be59b4dede02388a263113660b60d5381cef6626ce8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress upload directories. These links are designed to trick the user into downloading a secondary malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://enjoyisagenix.com/ckfinder/userfiles/files/21097220908.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e12eikgq4ppbblghe2tm250063/13108902641.pdf
    • http://lungshingcentre.com/userfiles/62772439667.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/52769816535.pdf
    • http://creatinglifeoptions.com/userfiles/files/42362003984.pdf
    • https://a-guskov.ru/uploads/files/bofosiganisejeno.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9bc1dd7c---29065728156.pdf
    • http://palazzodiaz.com/userfiles/files/fugogawotutosawedixok.pdf
    • https://cissud.com/uploads/ck_editor/files/sopusiduzinigebexivened.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ceba6be---12381082302.pdf
    • http://moonlightmontessori.com/upload/files/2796181612.pdf
    • http://beerskiboot.de/img/upload/file/68560364803.pdf
    • http://ipea.kr/userData/board/file/20996710189.pdf
    • https://cokhivietuc.com/img-vietuc/files/baligemosebebuxogosi.pdf
    • http://audiohrestomatiya.ru/content/file/65991194846.pdf
    • http://yingtailong.com/upload/file/210904165215251643bg6pzcvj1454.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134020819f95---repurumipel.pdf
    • https://big-affaires.com/img/pics/files/30737531675.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662b1d7447---58939426726.pdf
    • http://bankerz.in/qpic/files/tolebujivebade.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/nulabuwimofutaj.pdf
    • http://cwesp.biz/upload/file/vonigab.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa05df07c---7991744420.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/xumamavomozuxatage.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/27634359165.pdf
    • http://el-system.jp/uploads/2012/files/xelasavujepebiminubef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chocolate+donut+cube+world
    • 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_off0000e711.bin
b1b677f867fb959282f010cb4cdacfec474e9bddebc4855b492aac396d4c296c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10564 bytes
font_01_sfnt_off0000ff33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
font_02_sfnt_off00011745.bin
a68e0dc9437aa379cc63af7f5ccb3da7d1637cd6e81dfd2f553e3c0b6d5e5392
pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 17712 bytes