Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea76899749eb30cd…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23f8ee1fe993c376136429e27ae7244c SHA-1: fccd386099063b30a22f3703937f0acf650945e3 SHA-256: ea76899749eb30cd63ce81bd7dbb31f01571b64cdd38354df4c0df7214a2f726
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised WordPress sites and disposable hosting domains, suggesting an attempt to lure users to malicious content or download further stages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://easyreturn.store/userfiles/file/jitimorifibimitov.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c9fbefa7---goxovaxadagosepil.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/g6bf1h0vsajeikejf68enofks4/pogotiri.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d437432757---61218766633.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/93872497695.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kugd3fks9re3k9ohf88gvkqodl/29142259538.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b915ee95dae---feluzamanozuvivunemekora.pdf
    • http://ehs1958.org/clients/73155/File/zuneganikeja.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e062eed14---vuxusozakemabegewup.pdf
    • https://szekszardportal.hu/userfiles/file/vavufagesemugexibow.pdf
    • http://ed-web.cz/userfilesfile/ronezikut.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b0d39364---xigomopesiv.pdf
    • http://ajtoablakcentrum.com/_user/file/73946975140.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f1157815---41373003766.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608605b3b162b---wasebefizutuveligufo.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/h8mneeob4te1qn94oj1ld25kaf/62825452499.pdf
    • http://saltokisport.com/uploads/files/57403944930.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8fd3105c09bcb7cb51d13e59d8f4c0e2/kajazazonumi.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160765c26bb8d0---52771661424.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5f9cad0c---rukiladabizabate.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23046f4ee1184301cb5861e6fddbca09/86398891888.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f3c4fa54---suforema.pdf
    • http://kbchina.de/upload/gojezuxisapito.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6dd29fdbf76eb33e7f9e6d64932617a6/52152818972.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ea94a1506841cab0c632bb6496760228/73956425286.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=24+hour+a+day+book+free+download
    • 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_off0000f56f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
font_01_sfnt_off00010d81.bin
71157dcca2107ffd6a06cab74cc49a0f961a7843c45a2cfdafd17d465579e7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 17160 bytes
font_02_sfnt_off000139fb.bin
db582bb42a242cdee9ef1572ed70d59db58420fa2fa3f6ff6b2e522b13ad4c5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 10728 bytes