Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48dd54a51b9f6f7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 12:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53e313a1cdbf84ee9fe9a6dc94e9b547 SHA-1: 2d851051e1c931b4c450df5732ac0494b0bf7082 SHA-256: e48dd54a51b9f6f7a1850820e81d4fcfeb856cc93fe70a208707e452ca050a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO poisoning or to distribute malicious content. The presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=factory+balls+3+level+26 PDF link annotation
    • http://adhdesign.de/userContent/files/20210907093754-govelewebumo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6758926793.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2roio6rmnkb96vq1grc8ojmji0/vadalukegexegikexapozunok.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/dasijonuvawupenomesox.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/57457590765.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/78824384005.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/wiguxosowaxagotokabufe.pdfIn PDF document text
    • https://faceless.me/userfiles/files/10247990667.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210922_92383A07BE8C73B3.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/kizivododonenigudozat.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/ditezewinaso.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/65859355748.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/61227435860.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/wonidutesedojokufize.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/babf959599a9748aaa7eeda81ba995d1/fowujisodejitexaso.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/jopisosubogefikivabomar.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/rowakizujixejinedusim.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7a647c9943e30de942d43af66486057e/82531758840.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/xawetomaleb.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407927ddfa3---5761318679.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/nosuxagebixupa.pdfIn PDF document text
    • https://onlinendttraining.net/files/85504319764.pdfIn PDF document text
    • https://strechybenesov.cz/content/65593977278.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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 14224 bytes
SHA-256: 91b6ee7aeccce4130e70b7394787740de3d08313f53e9ee09712de55398d1d15
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10784 bytes
SHA-256: ba7a50fa133b9ce871c9bc51bcfc814067b99815b942ea37ed986bf014a311d1
font_02_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1