Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e0addbad1a8aef…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 10:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbc0322398f926b0e0dc106322c399fc SHA-1: 5aae7018dc93f8d8e094b0d3f69450dbfcb5929c SHA-256: 44e0addbad1a8aefcb20aa5b2ff835ffe091013fd21b43efe8c440c33a2f2759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, pointing to other PDF files hosted on various domains. Several heuristics indicate these links are on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sosnovgeo.ru/userfiles/file/rifelaxopixesagepurezuvol.pdf In PDF document text
    • http://systempro.kr/userData/board/file/78659791956.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/20150634657.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa5652278---fifasaxorisuga.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/8292805067.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/luberidukar.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/lemuke.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160721ee49df41---nojowapom.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/penopesozitirev.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f55b0892b---notolu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/jufivafu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/30265502637.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n9vr0fpnu1tr85mp19c5tnb9oo/tolejeremegawo.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/013dca342aaf69f100a2837b9d4599c2/92447348845.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7aac0b5e7a4a661dbb78db33d807585a/24331770554.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c0248eeff---zegagomivilopipabujutade.pdfIn PDF document text
    • http://hodori247.com/uploads/files/lirojanivut.pdfIn PDF document text
    • https://wonkingchina.com/d/files/fenizazemazinasak.pdfIn PDF document text
    • http://blatt-gruen.ch/files/dovuvo.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/64859213350.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f6d2eeb6---21663514677.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/ganegono.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/1103429629.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bf0671ed---28386234010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=eduardo+subirats+pdfPDF link annotation
    • 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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 10432 bytes
SHA-256: f1500c93e1266bc8dd806704b28d077f7f73ba43912ca86b216f10943c8d6e38
font_02_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 16996 bytes
SHA-256: 9bc8f0bbdfdc9b5d3561917b3c99f2455ad7dfcbf93065e30a53cd4d8ef17b48

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