Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a56ac86ab4ea22…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 08:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6a81a25b87f529435d1332b7b7d823a SHA-1: efdb1bb03d7052b5a341141a4493f0839ae286cf SHA-256: 21a56ac86ab4ea220e1f2eb96a03bcbb117d22bf496c453b6fb589ca88bf7613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a watering hole or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.pattyn360.com/upload/forum/files/sogumopagonim.pdf In PDF document text
    • https://ysh.my/userfiles/file/49958611088.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/89108712822.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/74663874992.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc9a9a53ad---63056718698.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/gibaravarupopadotafuzizik.pdfIn PDF document text
    • https://33mobility.net/uploads/files/96357961965.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/81803172414.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/81049509785.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/662ceb5649cc970cb5a5754a2f9c445f/36094252204.pdfIn PDF document text
    • https://activepymes.com/pub/file/74472497154.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/gilomewetodevoxuwureji.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/94ddbb55c1e2029516216c4ff8ca4f8f/ninefudowonozigonesum.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ru2uentrkr5k7dco8oogvjbqcd/tusafuxaperisofemomek.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbb02b731---23608949563.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/11552428462.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2cb32ee6dd8bcfc795348f38d440c049/ronakedamigafivimanufoz.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2d0f84f36c2b65a93f15609b100ad9d4/lipoxajofuvagibibotojit.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/31998220951.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1ab7c9d15---puzuxofosazozeseguf.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ced1a17---fifurawalasexisadinek.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7779f442b879d57c212c7163201679bf/78228640251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=estatistica+basica+bussab+9+edi%C3%A7%C3%A3o+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_off0000c175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 21764 bytes
SHA-256: b28086873ea807d70c5f283aa4e0ba01a3c83c32c5897af9bc640a04e6433b7a
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 11220 bytes
SHA-256: 122d601a49a20e1e0cd1911e904ddd1241934be1bd919688e2c86d547ac76539

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