Malicious PDF — malware analysis report

Static analysis result for SHA-256 d049ae6148530def…

MALICIOUS

PDF

86.6 KB Created: 2021-07-13 15:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f3f401f598ba4e90f553a4ffd207ca1 SHA-1: 741a73e2e31a91589fe5cb7bcc72290ef448e4cc SHA-256: d049ae6148530defe83120f3bcd5e9e3a83a3fc94ca08150d942ee93341b316d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c54c5e8b8c847afe83c471a7cfddc33f/24033303513.pdf In PDF document text
    • https://norservis.com/files/files/45540096981.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2674e3757---31768843036.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/58598451238.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/5266586633.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085748281919---niwelupiduxuzazikevaxa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dc026e8e---zerezezoboj.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/riforoxiloni.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/95273811739.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4e0jor1vi79i8h224p8invf2g4/66009779500.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/57848215320.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/46710758476.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fejawamososunawarexuru.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/674a23ee9fcefb9b214987071a3c6d75/16766280264.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gidezexuwexi.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/81489931503.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/13156996019.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f96743fa7---woninawadap.pdfIn PDF document text
    • https://designclarf.it/file/64465467596.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/8sugai43cj3pil40e3p3pjnk5o/fejimuvazukan.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/971328561d14fc37e21a571ffeab2a82/25426244587.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/43n8cr1mmqq0i8al9nife4sjp3/88527703235.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3bc6c0f81354f9bb961ab5b1580c5d87/50048895141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=is+dragon+fruit+good+for+weight+lossPDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17284 bytes
SHA-256: 9e0c4a3e9299d505aa92d4746273b5fb7ba7b0f089f69d9faf84268530d6f013
font_01_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 10772 bytes
SHA-256: 82064ea1613c1d7c37f50ede71c0c2fe691538b1d00c666e9dff319f8d878f5b

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