Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed407b9ac7c9d35e…

MALICIOUS

PDF

117.7 KB Created: 2021-09-02 10:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 084ef751f515c4cceef6807c6f605707 SHA-1: fe57fc53ef3b2b39caf3bf4f0ff75ccd80fc21bb SHA-256: ed407b9ac7c9d35eb7dec4dd8ee498d94a1e75762ea4899e3b04607179ec6735
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medvor.ru/uplcv?utm_term=she+unnames+them+analysis PDF link annotation
    • http://videofilm-tv.ru/content/File/dokigejiwarinixus.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/82737743840.pdfIn PDF document text
    • http://matras-devison.com/upload/file/26145735234.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c6d241f0f10cb16cbee54e2fa9d00d46/sifamasegamulovupu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e5865e89e---32074972946.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/20512343122.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16124280e3f9cd---77866653593.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611122c4a98ef---48592593588.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofuworaf.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ca4ecdd16---letupev.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/98afea32c5262e6b45e8276839edc920/xazokoginovesulesuretinif.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/fuguruna.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7204287bea5b08b8863f5a92e020f0e8/81063482088.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9215499a1f---xakabuxupozisak.pdfIn PDF document text
    • http://besteva.com/upload/files/97703306540.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/nibubesijomajokedes.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4dcf9a2c16f2402e9ea3c6481fc5a8c5/gegejotusetegelorixez.pdfIn PDF document text
    • http://moristas.com/userfiles/files/69244053432.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/97514827497.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/wisixinogugo.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021072216374458.pdfIn PDF document text
    • http://accronline.com/userfiles/file/49612353732.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_off00016338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16338 19832 bytes
SHA-256: 48655b530d0cf080944a742417c0fe1067b225d4de8547e4fb2bbc25e73a7c72
font_01_sfnt_off000196fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196FA 10444 bytes
SHA-256: 4461f519f588491b58dc34b0b2386be39f0108419e3dd872fa8baf2328c3e841
font_02_sfnt_off0001ae7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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