Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec017cc5e9e976a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-26 09:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: df97b21a93c16accf9c38ea2e249afdf SHA-1: 614cbd8c6980e616e1632cdc8c710cde3579bef6 SHA-256: 4ec017cc5e9e976a58c91983d1b74ff50f6c5b7e1b19fd0a6c0e61879290569b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous PDF files hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute further malware. The presence of external URIs and a high number of distinct hosts indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://samsungvrvklima.com/upload/ckfinder/files/59016208716.pdf In PDF document text
    • http://palami.by/images/file/88842702258.pdfIn PDF document text
    • http://cmtsport.com/pliki/65174224305.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609131af7b5f0---nodobuwaxore.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096b21e6ba30---69129580879.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/72808301884.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/18197192398.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/jexapulosowuxur.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/nofibozimejizebupumij.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86bb048b8d---ximif.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/41099890370.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdff45209d---95718379027.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8a9c8e1966f3766722a8903c626da99e/17958872681.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/2459905430.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/baafefa9bcc1a0b0caa0ca5162a355e1/roxupuso.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/luemv8hjpepsl498eqn0m6ljm5/pobuposape.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/87991599529.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/53731198652.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ma8qjpf7emf4daobtsvn4hbjh1/vovevuduxunapuzisobumora.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/vifefixaramamobixin.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1e9d9155ee630446ca9b67bef3a1e451/83929158967.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/l5nuromcgaa9880dq5tucuuj6c/12056481228.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608111ce09bec---64512335455.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/ruroxobufoxefiterifaduz.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/kasuv.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/24bf4249a1d23a4bfc483e5884c3574e/7455721083.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/88021504010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+set+switch+stack+priority+3850PDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 17336 bytes
SHA-256: 40c9fbc480cd5e9c7f66f4d715fd5aede27e0f5757994b200229f104cc8b6ff5
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 11240 bytes
SHA-256: 62d01b0351a5d0f541d71b51213b82ef214dbc4e8b746f1e10a0190836a1ec09

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