Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2303d86f26fcc6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef5677c56a404dfea89e67121c0cf0f0 SHA-1: fc34325052749cc3a150fc78dc018bb2ce6e017c SHA-256: 0d2303d86f26fcc651a7d5ce84c47e28aaea86a714e1aca9187283c60655ab27
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple links, many pointing to compromised WordPress sites. The heuristics indicate a link farm designed to redirect users to other PDF files, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=happy+new+year+full+movie+shahrukh+khan PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161434f762702c---bomutokixebojofixokije.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/43488996904.pdfIn PDF document text
    • http://screen.by/images/file/39575136996.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/jagagixakuzazemadusig.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210914074534482996.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/ladumepebidijara.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ve80qkpdjmsa4baopi5c96do2/sezume.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/28889437424.pdfIn PDF document text
    • http://steinemann-ag.ru/lagojumaretibamugilide.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/85829001828.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2a5f20945a619d58773443f3dbdf21e8/69966365963.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/degid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4d96a060---5937527944.pdfIn PDF document text
    • http://chemicalengineers.ie/images/9309562133.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pularovilabujarudugi.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/35941807555.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/pebivibovulatilunudo.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109040647571865.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/xakepasenupife.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/89367967795.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/55403843272.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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 17336 bytes
SHA-256: 598ee03e00e914b27ed58d62ae1a65bcf9852a01a6f26391d4348790d6220827
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10976 bytes
SHA-256: 4df8a863375eedb7e60401ac1b2b919bc22b4da04c548d615314d7bc3d56546a

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