Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58aa5b1868c4492…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 01:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63707349631a8b2f25a3ed0ac3ef70ca SHA-1: c9cb93366ba4a97151a38aee92dcc1c86360091a SHA-256: f58aa5b1868c44928e66d387e33b9471b6e2ff115e590cc53899f5773ce2c8c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute further malicious content. The PDF also functions as a link farm, directing users to various compromised websites and potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=automatic+licence+driving+manual+car PDF link annotation
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/157b47cc5ec769c32872d3d7ae7f0bab/96637155077.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d017ac53d---dodekuzuxiga.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608824199eebd---28625778902.pdfIn PDF document text
    • http://nfc.soo.jp/file/89169828322.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/22748748182.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/86940334134.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/72366481321.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/vezixix.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107170944336301.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/32896587018.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/22618541385.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/0497ddb0102f2027ebaad7e21b8de211/7965184300.pdfIn PDF document text
    • https://actorconseil.com/files/file/28904188577.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/39456365221.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6c9c80b7---25653380143.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/40627676181.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/2660634586.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd4533e6aa---bolofiwijimusomuwupot.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/65753712390.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075b58699ad6---5675238703.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/juxupokivujegopujarebupo.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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 17144 bytes
SHA-256: c632596f59107328bf671b408dea2b02c14d8fa883be9512cdaafe19831ad0ae
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 10692 bytes
SHA-256: 3eaa1c13ad0ac1e363a0c0ccdb885c10b3525a10e800dae0489999fd717fed51