Malicious PDF — malware analysis report

Static analysis result for SHA-256 4513c17346b6e1fd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 00:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdeb1c0d25ed0405bba32c7e43cef4fd SHA-1: 0c86723830c913297aa1b24b354f110548cf736b SHA-256: 4513c17346b6e1fd1f20d06b3c030b852ce758354f3698267f417fe5848be98f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to disposable domains or compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this as malicious, likely phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lakesnwoodskerala.com/uploads/file/97875070611.pdf In PDF document text
    • http://pzhjintai.com/upload/files/dubukoduwuleba.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/munodudoniginowunatomige.pdfIn PDF document text
    • http://azizolace.cz/images/file/73753584059.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf74ce161---8655986627.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/3292722758.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/bujuperadenu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/lixusemo.pdfIn PDF document text
    • http://kaies.net/upfiles/file/16154500636.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/59444945377.pdfIn PDF document text
    • http://chinahongji.com/d/files/72608240287.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/77009439769.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/sutekolebezotap.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/poxemufarepuvitovirodad.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/lojagavebifumejiwu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wanuli.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/51031077556.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/74510705512.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/99176353051.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ec6817870c291d1c5ae4b4a99eb802d/mumuxeneril.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bs3oo9lkss2g9dottta660orf0/jesitamatulosawekafuxiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=postcode+for+kangaroo+pointPDF 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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 19056 bytes
SHA-256: 5ea2c684938d8c82887625f895e69a1056201b316d951e8261846ea07b6954ac
font_02_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 10840 bytes
SHA-256: dda1ca45512a8e191146371580ae80245b8b9c7003ae087b93ca8f7d9dcc3d57

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