Malicious PDF — malware analysis report

Static analysis result for SHA-256 5118d8ab8e2e0951…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 15:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 362e03e394f23cf6f1a677c2149317c8 SHA-1: d3b8fbc236910ab5caf597525b62a000ff25d2d2 SHA-256: 5118d8ab8e2e09510114a87ca11b64f2fc416d86a3fc966b527ac1c55e84a7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9fcef8ca21c5a27c387fea70ff1b98f/50328393295.pdf In PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/66449424547.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f9669992---jizuge.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142b993b9721---gilitiwofetomifonusasexu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/92007669872.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/wimibetugenumegizineja.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/sikosibetoteburexeluvun.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/dafakurejorupivubuvek.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/gagagi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea6a34287---83585202256.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/tugureneb.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zabixezozisakeme.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5hpnsao0mv3d1l3cp4j1qvkv9i/17889951563.pdfIn PDF document text
    • http://humanlitech.com/files/files/79945736711.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7c6ef6b04af4b3aabb6374434ce87f65/84496293234.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133979de5d41---dajufezovelasasa.pdfIn PDF document text
    • https://diphong.com/uploads/pudimejexukadejitituxaw.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/nososoje.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f037ab86e---mudolonuwuwigepomi.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/dufezukanoranubigekag.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906080653980.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/balabeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+netrunner+the+underwayPDF 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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 15696 bytes
SHA-256: 2a5375c3ae1d1f4b8a0254647e486eaeba3562eeb009075e856ab9787e3e1c95
font_01_sfnt_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10412 bytes
SHA-256: 9b63b3158a7dcbacbd96dc0bc24aa16affca1c504990c01793eb879fe928d9e6
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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