Malicious PDF — malware analysis report

Static analysis result for SHA-256 630737ccab4aa976…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 21:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9759dbde671c2c2d8c37729747cda736 SHA-1: 6af21f24f78b36d96216832d5cb0dd40aecfe9b5 SHA-256: 630737ccab4aa97667a51844df26384a86942b96a1c36dd961cbaacfd60fec11
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/830df4adc9b6e8aa67860c80b177a3e3/39505327083.pdf In PDF document text
    • http://tsnpharma.com/upload/files/vajolamirujemuka.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/35751592742.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/nirogopi.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/80115878352.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/valibinumetexuzotajit.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/fejudew.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gbq745k608hqndprd5i4h6ndo1/44738719956.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090912085766.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/17776043032.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/posuf.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/zapezewa.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/37386032791.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/senokenagataxi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xokamuludan.pdfIn PDF document text
    • http://naviway.su/upload/files/duvelaxopudob.pdfIn PDF document text
    • http://www.77ice.com/upload/files/reloxif.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7e08a3a9c4ca0866971cd2eede169dea/93830172830.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/15701546628.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/75251153892.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pikarexukolirinolupef.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sadaxoluvajelaginiregadeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+photos+from+an+android+phone+to+a+computerPDF 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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18396 bytes
SHA-256: eabe4ef6fe481c5f7ad72fcd67dfdecb0063b0965e649dcd8a1738b54d21ea73
font_01_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 11064 bytes
SHA-256: d211b00a124f620bbce3bcc1d845fcaf58c7afe7cec707d7c69909a3823ba60f

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