Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cd680c6995058f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 08:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 250ed6ef30d7c8cd1b38b64eac7c5ab0 SHA-1: f109208502f19fc0cd4e7847645d53b38d364542 SHA-256: 45cd680c6995058f5ceb5bba4c98f373cf99b034a772581bba67dc8c6f46661c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These characteristics suggest the PDF is intended to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=45+degrees+to+radians+in+terms+of+pi PDF link annotation
    • http://hladonural.ru/upload_picture/devupaxutuwi.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/89011652110.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/13/luxoxunuzupujujab.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/noludufa.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/fepipegoxepif.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/43798389451.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/42543997364.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614485bcd68b0---kakokirakibuturosom.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/96236771535.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/texuviranekavifupiba.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/54713452315.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/83524617029.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/71797740526.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3dd77a5b---11434522364.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/6926844794.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3b9f90831715d6bb6a7d63916ed81dad/dofonovelipuxesegun.pdfIn PDF document text
    • http://195exim.com/datas/files/71099185417.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/dorural.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/36436808698.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/misenedodumezoliporobifos.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/naguxemeluwamuwi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54b538988---50743873591.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/6915577121.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/leduvimavogibelewuke.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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 17200 bytes
SHA-256: f56e3c37c3789bd0c33fcde9e1f3615da46bdc7d586a6d4f450b00a1930b0945
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 10908 bytes
SHA-256: cccb6ba98a755bdf80ebf3d559dc45d01f9b6b18a189e3f0b16e2ac40bbb2c03

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