Malicious PDF — malware analysis report

Static analysis result for SHA-256 8892c6d75d151f99…

MALICIOUS

PDF

77.7 KB Created: 2021-07-22 18:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab5e5ab0cce5ec04c51fff8cf44bce70 SHA-1: 642e00cc3f78990173a4e0dbfc46547fe3c641aa SHA-256: 8892c6d75d151f9978f3046fb86d02bdeb8ef2a44e649dce673c16640389ac9c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb0e444e9---jakemafunuvowi.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg2msnbl9eq5m3ca7l22h39vl6/fexokal.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dbhep8qpp1e6en18fltc6krgmj/furojoranitu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jfp3eq4i9c0slbacbsskoj0l7g/lodawobitoxizevesefelomu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/13d7b305491b1ce45230efa75d3ce4b7/bulagetakujidetuv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e26c3883---28870218297.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441dfb5dc6---bubabifiku.pdfIn PDF document text
    • https://goodline.by/userfiles/file/kiviwarob.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g8mng2a3qi1nagq1th8cdhivoa/41246416381.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cded04d913---79876262695.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4db8574d0---92121816657.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/78849461184.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/58740480257.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0dd66191b06721c04afebb875e8aabb7/75596242255.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/55072954559.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b088f9b857a---48430631951.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094809ce2ab4---68756928737.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kixejonuvuworovawado.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efcfd4f75---fowenogikatoxasu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e0a1ac94b9e049636bd930b97cada98a/66065821566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=highland+park+track+and+fieldPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bd8fe4ced76c39b074286c2d003eba67/fuxolalisexupivenurogaje.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_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 17128 bytes
SHA-256: 103bcb9d0fe034520110667715eb56069fb7d2430235a73f65a8b0033e2353de
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 10692 bytes
SHA-256: f8de2ae9e63dd8c92e76e3f8257e170a2bfc361ef1f1d7eca7d5cca71250895f
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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