Malicious PDF — malware analysis report

Static analysis result for SHA-256 469e16d1cbf9e5c8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017ce18a50d80e8fd88f73a753d03693 SHA-1: 48cd84d7fb8ac9e85d0da28ac7a19c870b323348 SHA-256: 469e16d1cbf9e5c899b8a9dcb2cfcb1954c32c9ce03d5dfa7a223f5dc2418644
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. The embedded URLs are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/djfajf37fqg7q51fjge10k3lbv/gazijufinaloxabugu.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5d442e67a0a61c4e6b752bab96ebde20/xiredebinedizanukikemizix.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gowitosoxajowidigesifu.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c703e6d463fc3467aadb95e9ec5772de/sikin.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/manutajixidolariwuvi.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/54102471208.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/efof.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gj630rb5qs7t8a4h7gcgl7s4bn/gavukufodi.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/41431715125.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gosatijixuwevozobisukaten.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608463306fc75---39838671217.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/31736903515.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ea333ddc---zinapesebopivopuxa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9poojo6dodqfhcg1vcn31ia33/nidazaxar.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/79086575271.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/kezajepujifiwiregerabogas.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/milikigebixasokorolizanu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13edfac421---53431298553.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/roboxazapodivelitikubezuw.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/25351670600.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/fimizoz.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/45306790271.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129fe44d76fa---6245550845.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51df088e8c---62464124606.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nipifewixazufom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nested+if+else+statement+in+c%2B%2B+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_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 18468 bytes
SHA-256: 34c319766d55e2135262bbcf6bdb117a41c6c636941ac01bd80de4b398da42b7
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 10536 bytes
SHA-256: cbca9ad8501ac9f8d04cd3eb8cf5bf16c0a5400e12aa88d5c3993fb654e3a1ce

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