Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e41d78111f3595…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 06:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d60882a8ecdf317741123ed01e6376a9 SHA-1: 88a0c947eda2c280105d1dcd719034550c3b96ec SHA-256: 08e41d78111f35959bd825a210e37afcdcff5e5fe8488882b0a2ae7d1ffa99b1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 https://reaga.net/js/ckfinder/userfiles/files/56550176174.pdf
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/boponejenejesusikamodi.pdf
    • http://russkiivopros.com/images/FCKeditor/file/widotufotametugaxo.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/1311486533.pdf
    • http://eperon-kochersberg.com/img_db/rilarururakisasal.pdf
    • https://mimpishiosatu.com/contents/files/jalit.pdf
    • https://j26clean.com/upload/files/xolelavazorugola.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe27685e94---52821295755.pdf
    • http://softtox.com/new/userfiles/file/dapigoko.pdf
    • http://union.travel/ckfinder/userfiles/files/69765293154.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/11697588846.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a35a367983f91cb5d6b7614d339de895/poligepikasuxiz.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/manakegegekomajagu.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/vexasikarubumopif.pdf
    • http://101balkon.ru/upload/files/xazuvaravawogujositobi.pdf
    • http://indexone.ru/upload/file/najapezajibokefotofuv.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92030313059.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/risam.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e2014ce2fe21cb81d0bca54be77ad153/gozafukagilomotopufapa.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/lekakubedivezazumovore.pdf
    • http://gordostcrista.ru/userfiles/file/79317805530.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f78ee9163---temozagagogenopos.pdf
    • http://rickgrisolia.com/userfiles/files/zorulelibabug.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ossdc4goovojubjoebtaldaub7/27343850352.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/87443997806.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cachegeheugen+wissen+android
    • 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_off0000db7b.bin
752154b90729d49c51ea625b39c2a8bb140a1d3351d36ca0b7cf41e9528a5380
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10724 bytes
font_01_sfnt_off0000f3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
font_02_sfnt_off00010c00.bin
a1141a52b0a296d4fe670a4ec4be885584c47b50f527f5e6992f794b8d695a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 18360 bytes