Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c7655e855d1ed2…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 05:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22d1e03926b33a504b31a55e570a9964 SHA-1: 7cc418b629a78c53fe883e68c490ecced1a6b32f SHA-256: 73c7655e855d1ed227449e342e9fb8574bf9d783463f70d58d3784770a89b3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The file's structure and numerous external links align with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=waec+gce+physics+practical+past+questions+and+answers PDF link annotation
    • http://iwort.de/userfiles/file/89762856680.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/getidi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jowoxodejun.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/sutifanejezokijugugofo.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/93926603611.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7212d40c89---97214123289.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xapemejivuxulijogegeki.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/60458578057.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/libujexasor.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h4ubmrhq8os3uf8t46sidosslh/97342044033.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/62234666337.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/686700192.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/mopigejipejeperuvimetas.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xuwosaxodujisazot.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812a7755c2b---kezikamakajezenode.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/sopefanupupoguserevijiba.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4742e06a3d.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30e6c968f---80688366966.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d127d06923922315628e48bceaa3519a/36772153257.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeeb2fc9e06aa80f1830fb366e72e016/xokukapo.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zeresuj.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc60807e717af5549d6a0a7095ffc116/resokoxunopinuwatagirus.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gerewo.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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 11232 bytes
SHA-256: 79357472259384d353187533e6197edaaa7b40d7e7d6b5453a0676684d4ef8b6
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16384 bytes
SHA-256: 5e9a3d08875ff0de0f5edfdfc8fb47f57f2c8275d6de6b4e7e6922afd5cd5818
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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