Malicious PDF — malware analysis report

Static analysis result for SHA-256 089d11f76d0a2aa8…

MALICIOUS

PDF

86.5 KB Created: 2021-09-11 12:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41b1494338abbf06ec344f57d0e68e7a SHA-1: 0529f8a767198f7d868fce339c21641a936ea416 SHA-256: 089d11f76d0a2aa8244c011f5cf93f8a4be90b6ba0f7171b32cf56fd5166d154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://angelsstaff.com/uploads/file/jirerosoxujilakilototite.pdf In PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/82027557784.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/5710449840.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/71142322399.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/maxituvejobovujowedexirez.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/90987488646.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/telopadideda.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/maxesajupozusuve.pdfIn PDF document text
    • http://spbi.cz/res/file/78008433456.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/su3nseouiuvkr63nu461momt2i/gusilitexokinakegoresarus.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/43132a9b3d3dd010f73a2524f51322b7/kofadenovosawemasema.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c66721c---51620526751.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/88020297333.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gegolokorowigosoxaxika.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/55624353166.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gop2kenool17uhfvr5i4gfscq4/3748603907.pdfIn PDF document text
    • http://c-six.it/userfiles/files/69958864064.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/57017772904.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vusesosa.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bibasot.pdfIn PDF document text
    • http://hidramaco.com/files/files/xefodolepe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/522f21449ce2174dc59ade1fd5c0c9fd/bizemodulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kimetsu+no+yaiba+movie+usPDF 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 23932 bytes
SHA-256: d86030f31d266180395ff12d87f9e57452b13c144cbc3458ed4a34af6148d225
font_01_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 10532 bytes
SHA-256: 4da0123d321ff8cfeee47c935286760578be9936bab28717210f5143541028d3