Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe73fb6eed098f2e…

MALICIOUS

PDF

84.5 KB Created: 2021-10-07 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 42048503e5a129b43159267d2458db39 SHA-1: 0c0ce6836423074e8ae345e9cbe0fb4a7ef6fe74 SHA-256: fe73fb6eed098f2ec32884d54eb3bf25b453665c74d37aaccda07975adc9cae6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f043901d5e---xilasizojebaz.pdf In PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gaguxel.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/rupekak.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542c10274d9---guzibitumizejewokomuju.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///76393157726.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/92594399910.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/25307701468.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/fujijut.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109051655585423.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6tmdp86etrc430cl24979s98ig/8952496268.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/68552075225.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/75797052ca688a08b0c305e4393b8fa2/rovupekoguxemu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d8cf0ebc---xivotesulinufuxer.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9094cc43---93183453664.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/50726393067.pdfIn PDF document text
    • http://polipack.ru/content/file/melaxazodur.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/56684882422.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4906cd1bf---volenixemek.pdfIn PDF document text
    • http://feg.vn/uploads/files/48219430028.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/kupukowoguforekugezoda.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/bexos.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/45041183417.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zaburer.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xiworukurakawugudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+english+reformation+revisedPDF 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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 19072 bytes
SHA-256: f82231f5552f7afd9eee7ba78fce4adbda3a9789039d9635d1be1ab3bf4df666
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10832 bytes
SHA-256: 8ca986b088b1b726ccfda362d892201dd4924a4453a1a9674dce003a27749fed
font_02_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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