Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5cd89365833215…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 13:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 403c9e53541ea3702682cb7b4d898358 SHA-1: 574cecce7fd6814d49d4d9412418d573697b3a16 SHA-256: bb5cd893658332157ffb67ea2de488fe23d798cfd00d115b24812d221e50fb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dobre-jaja.com/Upload/file/gufozugaxuwerolebezox.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/kubigakatanaru.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/96358132470.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308ae955ac3---77892572083.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea0e2dd745e736343d28e5538151c349/sulagusuludu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138398e2e29b---98814537273.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/tojig.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe98b9883---58044237642.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/viwar.pdfIn PDF document text
    • https://cardolf.ro/files/33962585126.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/94989728456.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/14000584204.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/89063844455.pdfIn PDF document text
    • https://datawire.gr/files/files/65501197765.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/30454377050.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/48634499236.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/tadurox.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/57456808616.pdfIn PDF document text
    • http://synowka.pl/galeria/file/surukopevimetotapazix.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/41623446709.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/leduxosebepavelitezofew.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/mesepojotamikezujakogoran.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sesinunulemawawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=8+ball+pool+line+hack+2021PDF 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_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10740 bytes
SHA-256: a7f33019bf3af84265f8a50796ecb3a709870bbe66ebbb8d48712c6c128edc6d
font_02_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 18548 bytes
SHA-256: cfbd1cff2d9fbe040ab3c0ac91a1ba43bdc3a84687e68b99576a59593b0b02ea