Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a793399eef76dd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 06:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 929c2734d5878851b84173d69799dad4 SHA-1: f58c9cd657e652576fd99a87d0d7bec987b17ef2 SHA-256: d5a793399eef76dd355e768e8ee986acef2ea0f853cceef8de27773d096784ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=civics+worksheet+the+executive+branch+quizlet PDF link annotation
    • http://radissonhoteltraining.com/userfiles/file/8970244972.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/90822222205.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bukogujavosefanefotasefax.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gj3lbqtu1n9eu6ftju13r960ll/bojesipitunewukibemu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d7f3c6e8---lejotegugevom.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bb03da6a462328c37abdcd31a6c9d2ea/minuke.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/132021aa14aeb4539e026672b002bc83/87682813419.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa55cacdcb---razabodesemagavivutakikib.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/74092602368.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///13229688197.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd554d92b---jiliseregi.pdfIn PDF document text
    • http://prosquash.by/data/fopor.pdfIn PDF document text
    • http://araonline.hu/uploads/file/49330416535.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bikipafide.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/90124940556.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/2472035194.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/buduvipi.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/gibaxupizejinebesutivaseb.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/57314951566.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/30mtc7m2hpt1n8du7lnm4iblkh/66953439079.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f2d33c85---pamow.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/kegimogebabibununezev.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607719f6cebac---todoxanexilalob.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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 11152 bytes
SHA-256: cb9b1eb41d6d54eb34b49903c6edde03eb42ea115bc00abc8f5b544106618845
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16696 bytes
SHA-256: f71ea4dcd9d4b10c52ce7c86c286fd8e95f933a0ee3c12326bd21b2d42a1d8db