Malicious PDF — malware analysis report

Static analysis result for SHA-256 b957a59d378abea0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 00:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d75764c0be48ef4b0ea32ab1a3e04df SHA-1: 713d00d7d9d9a9e2f7097a6ce3bb079f0e0b04e8 SHA-256: b957a59d378abea08b28ebada255f9400e1ba2a0dcd573f2007af68071c6205b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=how+do+i+find+the+vertex+of+a+quadratic+function PDF link annotation
    • http://congluc.com/upload/files/tawosirovune.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/67761231366.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210901_060744.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/50951013052.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/48592886367.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16130fac20f81f---bebewisazuzebuvo.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/korutusudijaxepuzokazuwux.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/14596300885.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/35959318839.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/defepisudoridogopibes.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hkqh5fr4k5et5mfkjd6lq5jav6/18862899164.pdfIn PDF document text
    • http://klinok-saintp.ru/files/15005361782.pdfIn PDF document text
    • https://samudra99.com/contents/files/vitozuxepuwujabikaja.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109010805332558.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/77695232445.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/2328087107.pdfIn PDF document text
    • http://nemochem.cn/upload/files/92942159129.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134237408b23---zodejususofekojudofirow.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/wepewunibirexafex.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614654bdc6709---94575910652.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peganuriwosawibeleg.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/40605967993.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/99315422325.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10848 bytes
SHA-256: db635182dd092385d6f05138c9e901b92c8479d6e6ef28e03e7fd97eeb2b5f7f
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 19188 bytes
SHA-256: 07f0d8d0a79817fd4aac88816e22c661aaad24f259ce00e134efbe9d65fdb422
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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