Malicious PDF — malware analysis report

Static analysis result for SHA-256 e040399b7bea918c…

MALICIOUS

PDF

68.6 KB Created: 2021-05-27 00:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e05009161668cac03342e9bea8ff1431 SHA-1: fc112da39e8434222fa69fed0b05b7a8475b5da2 SHA-256: e040399b7bea918c845424f11e5d39951a8cf541ab443fb4e7390a106236a4bc
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to redirect the user to a malicious site. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=fiche+exercices+calcul+litt%25C3%25A9ral+5%25C3%25A8me+pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b7c85346---zigiradukodimomasusa.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d423397541---8291907108.pdf
    • http://bahattinburyan.com/userfiles/file/zaxekeduzetatuso.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a28b9d795---45233901200.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2e8a84fa---gutonavifusuz.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c5aca9149cd25d4541a104810687420/20277992285.pdf
    • http://omonetach.pl/foto/ilustracje/file/buvivexesupitij.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c6fed169ff494cdd2b7dec463231e051/44777481258.pdf
    • http://luingpyrex.cz/foto/Image/file/femufajikesivopegigorifi.pdf
    • https://amatnieks.com/pictures/image/55880851.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a480aa7b9---juzumazozulaxowedeje.pdf
    • http://abimobiliare.pl/pliki/File/25577449637.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb3e269315358bb847853f63f2fa8a94/disolesojogewebo.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaecd3158c---97428678219.pdf
    • http://adance0112.com/upfile/editor/file/lalit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd36.bin
d5018b8184860e8201885f1643631b4837759cda2168d04c29e4f368a3b00a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 5828 bytes
font_01_sfnt_off0000e055.bin
26c275434f67716d20c2507715a079f3279129440db89d60b122030be062f68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10720 bytes

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