Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd0aae633c41fb0…

MALICIOUS

PDF

100.9 KB Created: 2021-10-08 22:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 628528b61a1418640ef31e5223f7848d SHA-1: 2e2db379e58c9e2109b3ecfa4803fed9d50f2ddb SHA-256: 9dd0aae633c41fb06aa0139f090c6ec00f4e89520998e8329af8347b14fa1c7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are designed to appear as legitimate documents but lead to compromised websites. Several heuristics indicate a link farm strategy, with some links specifically targeting compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=cat+meowing+at+wall PDF link annotation
    • https://bodegoncriollo.com/userfiles/file/xizevuramimetalera.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/161303651.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/purelekapitovot.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/zabisatilenusuf.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/tufinutixibewijixogi.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/99927885001.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202110070236264609.pdfIn PDF document text
    • https://thehouseproduction.net/file/kuxorebe.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/mabijiviwowodibatupife.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/925d3149733c2e2b4560405d8b1f1c25/jexevebujapis.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kopowepajemumedokaze.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ptegi3lbjq0dn3fldmukl5u99v/luxozululusabaledin.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lelojinimaxolovesaxuvor.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/29228175927.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/dirab.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/70548482108.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/63367024666.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/sawipavirotu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/50709071773.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/papetozax.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/83238533918.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6b956ut174jg256e33psl901r6/bojamekoxugosokir.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_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 20624 bytes
SHA-256: 7beb38482cd5bb4522420e72841f807893718c5e4669ca86c1d106a9b25253ad
font_01_sfnt_off000156ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE1 10300 bytes
SHA-256: ae9e87761628cef140bb3fb2fbdbd8b3ef982a13542b0da730c0a5ddbfca663e

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