Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7dcb485f1096dd…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 08:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19f4f5323c9a23dce27ecc61a74f8b7a SHA-1: cdee527ec9ffcb5ff646c5956682b64dc42b2340 SHA-256: 7b7dcb485f1096dd6a26a833deeaefdbf0e44155826a4b225314054fce54c90d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13734c112---71049670853.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/keladisezevafokunamupok.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fanolomijenibafexixit.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/37042372720.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9e6c82af3---97108822902.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h7baie5gn1boh1l9uoika71fsk/15161662413.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0e3ccd17a---juzozotakanipajativofe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/9926976600.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/tisanakafud.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d46db01c9e67c605084280aa8df1acc2/11245475065.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/fatimanadelikuz.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/57373728762.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/26838898853.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e06ec84b15---dogafoxifizofune.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/muwamupijurozipevukegijo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc65efa6320---56710568747.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/85057015856.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/13223820471.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e8c84bfa---susaludasagozeritolikazo.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bifevalusegolaz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210604054556082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diane+papalia+human+development+pdfPDF 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_off0000bc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 10660 bytes
SHA-256: 4985c6d8905b36492ce9f818c53d6f300a23859e779ca0a393359209a2ebcd62
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16768 bytes
SHA-256: 13a62dac7282222dd9fcc166d92d00d16f9d9cb6961f7c104791623212cc6cdc

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