Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2eb79a936bd156d…

MALICIOUS

PDF

81.2 KB Created: 2021-08-26 11:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e50ad6bb690c3ee9829befbb158c11dd SHA-1: 8f25f7193579e7a1e37e0748e8ebbeea6e1b3f2b SHA-256: a2eb79a936bd156d795c2866e683a92270c76c1cfe6cd00c57387479a7e470f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://upbfassadenbau.com/upload/file/30496709340.pdf In PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/33252963304.pdfIn PDF document text
    • https://aedwea.com/upload/foto/26126691115.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607109b9388e5---pigefukikawibovimekijeda.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/melanofad.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/59033044189.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129073468b5---96520195533.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fa89a11ee20373175fe6e448e2f5132/879900674.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/32390561511.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/repovetig.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83398622561.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/60ejbqk2l8lc6r23h4sop9kclh/60862025482.pdfIn PDF document text
    • https://777mto.com/contents//files/kumefu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/57590522099.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/82238580003.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/monabutorow.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf1bdee59---53572139164.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wutovo.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/30248921558.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/33d0b828903236911bdaa4f2f92a5640/74304544677.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nexomugonodapo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b5c1b9ca---rawaropogelasixixis.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xalatolozugeguvowax.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/putowelejabogepuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+red+band+society+streamingPDF 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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 17636 bytes
SHA-256: 58d9095250ebba448d71e482bf60a3b6dfc2203a5b744947818df28229bbc12e
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 10988 bytes
SHA-256: 7029eeaa34924cf89f56c4077b57dc12458e8aa7645c496f90c17627c36a5b90