Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd2e18b814da951…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 23:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d45e520c694de76530604410326fa6a SHA-1: 492d145c14ce6e8cbc942a770d59e9132c31e066 SHA-256: 3bd2e18b814da9519ecd03c8ef864111fd4b013635a4535c4495e280f0d4fe04
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.jindatunnel.com/up_files/file/gezojugukoruset.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e8d627f---gidogorebukibonifu.pdfIn PDF document text
    • http://holzweiss.at/goketositunazubifugixaref.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gixaroxuzoraxuwavude.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/20569730688.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r4r09iof6bg830b355b2u81071/rewom.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rizadoxom.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131015feba9a---wububabusu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f46b14ee---kotiji.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613310a07d7fb---kuxefekagofibolexagefil.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/14327754942.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bowabomowu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/36792630505.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/77321143022.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/14129039146.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/gezifaxere.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/valuz.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/xadogosibo.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/87425848020.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134942469e9b---99466267274.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nefevufot.pdfIn PDF document text
    • http://rubensova16.cz/files/file/sixomix.pdfIn PDF document text
    • http://net-marketing.hu/images/files/pazususupawajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cartoon+yourself+aiPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 19964 bytes
SHA-256: d4ca1e7f494f6b56226c6dd6ebf6ed6d8c588cf605886ebaa30065690e5728dc
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 10452 bytes
SHA-256: d3c96b56887c138c6cb8b351925adea8c7801da908ad91656a5ff26ac651fb16