Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a85b74bfc84ef…

MALICIOUS

PDF

70.6 KB Created: 2021-09-10 15:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19ff8fa051436b61ccfc0452217b5ace SHA-1: e40156e0839a7035f70ce152b5612d4bc33c2a7f SHA-256: b56a85b74bfc84effb71cbd34eb6ef0d0752b392e1163bdfb7764a0919a0e142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised domains and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thefertilizergranulators.com/d/files/zetizelozoxajumakib.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378437a8bbd---kokuxixesorine.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/51553928030.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/majale.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/pazixatosak.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/xasozonogipo.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/niwudavuvegamojudel.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/38302867870.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/58237444721.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vasawevowiwodizedosaza.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/kijarerudizedun.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/5929608958.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/lemifuwiroburuke.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/ranasonavixokenu.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907223304_fl63yf.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135281c8fe97---wipogaparajibobaxi.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/mabelulowata.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/gawom.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021922156395877.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/punax.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/1456644702.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4c4fcc94b134157c3cac116142f3f1c/69975212241.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c450021e5de2252c89dc92780de6315d/dirozipiwamodumif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=class+2+maths+book+pdf+downloadPDF 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 15988 bytes
SHA-256: 1d0787b934ee743228a85eabd3c9acd62470362edd1e4aab82a83595e95fd7c3
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 10908 bytes
SHA-256: 26d4d1bc517bddec479b073611ba95ae2afbdd6a81fd60b96284dba802b5b3ee
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.