Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4a66ea56c8078d…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 19:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a87ffb3561fd9b8752e2d4feb059af2f SHA-1: 8624f3269d6b686209411eca84e9627801d634f8 SHA-256: da4a66ea56c8078d043f4e41ca9cba940af268eacda4da77c9c7e3612f340d0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or malware downloads. The presence of external URIs and the overall structure suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=teoria+psicosocial+de+vigotsky+pdf PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85b82fadf---jolojozimisitesebifoxese.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/13/wizopudoxilepamigadegop.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210616013426.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe9db470c3---zojejok.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a90a400de06b8bbdfbbf63efe38ae308/fozitegidatiweke.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210518204743.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/cfb4fd0999d377622cf5c7a4796c2b20/susobojak.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/84357ddb54ba72f01ee128fac3a589de/96425606867.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ddb5327---99001524000.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/najudepuzojabifitoga.pdfIn PDF document text
    • http://webbuilders.com/files/file/wexubunizod.pdfIn PDF document text
    • http://mariancozma.com/_user/file/78277587047.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aeb25fe24---45778681539.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df00b311eb---99519161451.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/73252739691.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/802dc3167b96ee3a0c8683a547f0466b/14082037571.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/robotekenazamalegixe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9efi0mu922fakc1pjtrk1cmo5j/84143785672.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/5613026595.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/1744532190.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/79284808436.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b18ae083---fipovimenez.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608112ea17a42---vuwed.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/kisakiwawetolibomewo.pdfIn PDF document text
    • 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10924 bytes
SHA-256: 0be162dc26e12658e4aa559d28a46bb5c6706015ba054bf967c837f94d0bae2e
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 17928 bytes
SHA-256: ab6c460783e97eb460e734ae68f222b8ec24a664529662723d8ad0448b3263a3

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