Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac739a5931d43144…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 13:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e041c39094204c147d55efcf5be3ede2 SHA-1: aab789224c1dafebe30a08d7cd706a6d4fc15e52 SHA-256: ac739a5931d43144ef8f457d40d25819164216cd37526e83d6a3c89e3d38a116
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=brill+dictionary+of+ancient+greek+pdf PDF link annotation
    • http://abwsalisbury.com/uploads/files/11667477672.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/mubiluboxijikimef.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6bpg0m9cobtll7q81741floib/35343699067.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/lutafepufod.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/fazoja.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/21569494965.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/dotijupumisalipaj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/29a0c48ca42cc8ec5382d9b58328c4ff/guxas.pdfIn PDF document text
    • https://plasy.com/uploads/file/norasaxogasipiroxep.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8b81b718---kituxonaw.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/j14nucgoogaj72tespg85k5b58/kabobajavijabezeraxejimi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a170574168392bcc88be86b01c2f00cc/71689131732.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c7af73140---12340029878.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/jaxifiboweg.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/50263908887.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0ad8879003368c947f4f0fc515b3d81b/wafalaxi.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/dib2655hmuegp23ng1ead2v5o1/gavunenapexive.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/11798049588.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700d4007cda---1462181481.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081700054073499.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4a3d54686be656e15fb50ff968b2c051/51171316819.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/vekesurosesosu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb31c8470d---12717250617.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/80261656194.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9bc45e35f036fc9159f91b90032a48b9/gofaruxuvotawuwirodi.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_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 20124 bytes
SHA-256: c2d62333b5085603283dc235f391492e2c367fea58e7b746daf4ad6266032390
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10888 bytes
SHA-256: 28e55c83257ae5b6ed61ba33a38d1221290ec4185f84366f6073e4c27a3d455c

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