Malicious PDF — malware analysis report

Static analysis result for SHA-256 70128afd2a5a4e3e…

MALICIOUS

PDF

92.0 KB Created: 2021-08-20 15:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 574990f7a28598221780228a8f8fedc8 SHA-1: 5aeb7f338d72c866ee5db6be601f3858f7980793 SHA-256: 70128afd2a5a4e3e2c451ecd2ca3d62536a553bec2e7c02e3c71812b2267751b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malware, aligning with common malicious PDF tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2k7jmbsccak8bubotiq905h1nr/lesobo.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f00cuptqvmitemifcop89gfht4/69610025922.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/305633767197f55a67327ea949c288da/74389234938.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/gijitimo.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lolofufariviza.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/4aa3ff9f78b187efaa87993aa627a6a9/kisofolusumogep.pdfIn PDF document text
    • http://termocity.by/pics/files/1408755909.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/03d62c06358030fbc15e4db07bffd8d0/laputunowejuvinonisijo.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/sugejexevunixaj.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/35359424394.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/5149113649.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4267cb292---41454644740.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/vazenobifetiwug.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetisujiloravumoz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ba6bb8457c95bb263fbc041ce42bf6f4/fatobusawudipaju.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897327bb266---wunavelujed.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/27096807347.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ksmu3m30fifpt0a1471t8aq091/14812274121.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/be519902326a8765a92b4159525d4bb3/13290161810.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/refoxajituxegageto.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/54fc8d961853dfff5e324ec914d3250f/65447936792.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/puxujejubekozo.pdfIn PDF document text
    • http://18554080.com/userfiles/file/83733478991.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/42040018009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=como+recuperar+a+mi+ex+novia+fabio+fusaro+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_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 17620 bytes
SHA-256: 2e8bea77a990bf80a089a61a2dbcbd5f52cb9950e837f90eb6d7caf1a4b0fdcb
font_01_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 11076 bytes
SHA-256: 224be5572ae81a857f7892a66bf51b4f9a17f6eeb02749adcf5a8ffb7dbdf947
font_02_sfnt_off000148fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1