Malicious PDF — malware analysis report

Static analysis result for SHA-256 85477367f09cea0a…

MALICIOUS

PDF

91.2 KB Created: 2021-07-15 21:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8892c39147cf8c883103b6755471d5b7 SHA-1: 709b69705b3305367cb78cabb100aa0f49d59e8c SHA-256: 85477367f09cea0a457b172f2f1a44f017a55b3cbfc909538d76c87c0524e752
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30839159446.pdf In PDF document text
    • http://biotledlight.com/userfiles/file///71545165981.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e39fbb5e1ec21cff24f66c30bd87b827/gawulasesibevobozomaki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3e87c1421efe9c071e572395d8f1fbcd/12796978197.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48821b44aa---83982072350.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/94793005492.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7d745229ed8270ef040bf3cf9f18303d/poxewebodimuwegev.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5e45859367604b6426af11fc816ce420/lumuvewadabijasiwir.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/24506731686.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/viroseg.pdfIn PDF document text
    • http://mqskin.com/luutru/files/duzenofegikudakeboronum.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838db2b543b---76605696593.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/65649358358.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/ramidavokumerolejejuz.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/33954288113.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f1990d57---56342937273.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h1iub9ktvvu6f0hfcm3rfhp8d5/14321231817.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/00ba9a4f3944daf6456bfc2a7aa6a36b/79528257354.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/luvepimip.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c430648d0d1cf80a22c70884c5225854/56545400510.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tcup6k25rs6rq3c6co4ll8uifk/25545094538.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/tufaxereruxewizema.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hfluum8en64v1on6n59i194490/19625418197.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea59bc4769---64996869331.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9683980ae349ce5f01dc208cba2ebe55/ganililapakutarog.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad471a32d33---zepamibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lucky+patcher+hack+shadow+fight+2PDF 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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 11216 bytes
SHA-256: 187a079398bb870f7ce55a7304821d154b168ea1f97c28b0d3b0d288ee82c038
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 17968 bytes
SHA-256: dd95b36da78bdafd27a081a998a7b8f82a7f2a72fdb0eb70b9894670e3618273
font_02_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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