Malicious PDF — malware analysis report

Static analysis result for SHA-256 365d19332549a6cf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 13:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fd2a2ec5d95bca888dcc8e99407440a SHA-1: 09f6ae4d104d1f0b2ca471d67030e048966a8bad SHA-256: 365d19332549a6cf3b2ef3e7330486abc2e7fdf87d2af1b1221b18c02790e109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to lure users to external sites. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for further exploitation. The ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160705d7cd41a2---sabamak.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be67bdcd711---90568970675.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/sodirewaviwipinir.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/gezejolufume.pdfIn PDF document text
    • https://educhina.mn/editor/files/25606172239.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/bc1bd4b642abe37e411e88eee64f702e/52847705309.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k1qr7lfd9tc6pd31uutj50k3bn/jimukolifawimumazegegi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/33537854875.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c382fe93913---sejuxap.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105152227456550.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/vozisarizagalemeroxem.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/61907582736.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9be93eda0---koxexuteroponuza.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/zakewoviwoku.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/67293927216.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/36015999056.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/81412713455.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/33382994464.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/21948734791.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/66488807350.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210723_013429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=paper+cutting+and+folding+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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 10728 bytes
SHA-256: 612c4f8c559414af725330b859cb7c9ac2662dc64ff68158c325347feda6b309
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 18196 bytes
SHA-256: cf7d390cd0f02a6215345d18cf927ab9accfd5b2c5d668d7f2945898c3d39e9d
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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