Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e76b16a763e925…

MALICIOUS

PDF

91.3 KB Created: 2021-08-03 01:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 97bdca9f931c948b3743eeed220cd8bd SHA-1: 04f68ef2062f0c0bb9acbac6d58d778856502cb6 SHA-256: d0e76b16a763e925b2f20452a5cf76cccc3e8f7e356ef5da965247ed68331747
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting. The primary function appears to be directing users to download potentially unwanted or malicious software, as indicated by the URL parameters and the ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=my+singing+monsters+hack+apk+2021+mediaf%C4%B1re PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070b2237da---pobobonawolepujosupepe.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851edbf679---vobobozab.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e3d71e045f545364771eea75b72fc951/goligunaxorovaj.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fq2ftupsea2lokdf6e0mv9sutt/10069677776.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e383b5974---nimojolumomudufuwo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zadunopapulo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/fovukabo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21bbabd1d---22903907149.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/23026136559.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/rorovatafojegamatikexo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/57904717497.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/shdqgno1klbargti8i6t2n0t93/70125751165.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/nidimegor.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/57609269579.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16083647212996---jabawekabenobokidud.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/palijudezijoxalise.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072017214685.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/zibejefipap.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/bivovomezi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788b9f3932---74615149217.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608497e0851b0---fulizomuxakowuzumofisaja.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e36439dc3f---41690147243.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/81512209292.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firurufudaravaruw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 11560 bytes
SHA-256: 585b530d0d9aac4de3cf340d6d9dccaf973ac175b3fe55c9bc11c6d62c1de862
font_02_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 16728 bytes
SHA-256: 272f1479573d731fb79aff02e9c6f01ef2c94db77b20fb226a7d416ca4d5dd8e