Malicious PDF — malware analysis report

Static analysis result for SHA-256 897fc4368bfa2a0c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 12:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8c079aa4a4792056d94eb1556011e8 SHA-1: bdb555d22fe130452a1a8434d0461bcd11d3a6c4 SHA-256: 897fc4368bfa2a0c296fa0092f48172986a0700ffcf9b57105c1acb8b487fa84
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18033fa2d---kexavi.pdf In PDF document text
    • http://climtech.com/files/files/rigojetaxubeloteferuxeri.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514152227939686.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef5b6a4e2---mixokasozerilofebabedaza.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/74211890947.pdfIn PDF document text
    • http://deltools.com/userfiles/file/51859611790.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0eb277f836ebae29d26a884fdfaf7510/vazedorog.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1f056783edbdf79aacc0eeadb148e735/11996021217.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc99c92a6f---xajonukixomabusidufa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f921f9b9---19443579966.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/lirufamuperominaru.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vidagapolew.pdfIn PDF document text
    • http://deauville.ru/files/file/26356546454.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///butonej.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/51267454979.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/3964868042.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/3761569988.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c4b649e950c96c57f748c25ac5a36fc5/denowajigomobe.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/gubof.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jaretomen.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/jumojijibafazupotulitux.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/33246926704.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fdmhp1ltakdeu3s9fut185sh35/tadowa.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0mh5m2s465o9c1201mrjlo817c/8107999142.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/lawufiwaxulufavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=o+que+%C3%A9+protagonismo+juvenil+pdfPDF 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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 19980 bytes
SHA-256: 7ca7118e78bccbec03e9008aefa9e9aa14da61e5f55b3fa6b83777b1fb23c99c
font_01_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 11464 bytes
SHA-256: 5f8a9839b77afa7c26befa07aa7927da74428abc2a9f11febaf087543c09dc0e
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1