Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8040e02c10c777…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 08:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ff2a5e16bf545b35de2ff64bffa00ae SHA-1: f0bcd39baa170cd6d0b27a0e966300f4f16f4490 SHA-256: 6c8040e02c10c7771c668c2d888971031fe73a3e3bd7bfd782252508dc758649
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body was unreadable, but the presence of external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful 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.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d60ece15---mubeneta.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/komuwetolufufidiliku.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c25c9cff8a72f6454b8f9da0e61d382d/84687127864.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f2605c02b915bf50a2dc2191f524d087/lidabi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cdd82a3ce7de1e5724759f326909f6a8/37434474608.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098831078d21---siluf.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/pokezugoz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef5052ed3f4b541fe2f41b90a8d366bc/77577766701.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1f65e42f---29198381347.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161335fce09093---pugirenujaraxo.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/46787982745.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/nororetedewut.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6351826bd---gevasokovazejizebaka.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612774ac50031---rufamopejusavoxoz.pdfIn PDF document text
    • http://sieuthigo.vn/upload/ck/files/zonanajopaku.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0a44842f---mudobamivarozepotozupeb.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8034d9da518cb944a7abe967b010b7c5/95747194665.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4c80da42c54d8e379e6a8989bb25095b/lenesipajit.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/31215822938.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d87dc79eb79---12138130288.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2498165020.pdfIn PDF document text
    • http://allycatering.com/userfiles/77139403260.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/37818642553.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/fowurujuru.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b6a8fb29---rowekeliranoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=polyneuropathy+physiotherapy+treatment+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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10976 bytes
SHA-256: 5b4ab8ccee28e98619ae80e15b43a9f26828893b91547461cd92d795195bffde
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 17148 bytes
SHA-256: 5e2d4e22c3a12fc208a118d57c6b7a31ffdc2d9c4588791ee07ac0aacecd3634
font_02_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1