Malicious PDF — malware analysis report

Static analysis result for SHA-256 5562598a74723477…

MALICIOUS

PDF

104.1 KB Created: 2021-07-21 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dee39020aefe8b8054716898e0fcd10 SHA-1: 9c0d2c9e76fe9763ca3242b08c4b36152818d88b SHA-256: 5562598a7472347770ddbb47f7d72e0bf701eea66e004feeeff16bc8a8e80ef9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting sites. The primary goal appears to be SEO manipulation or directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5a1b574dcbe88e7498304fbf78b569d0/86155105022.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60a30ec1b470399fd17ec79f3aa8df32/48872100612.pdfIn PDF document text
    • https://sbufficio.it/file/50534908344.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb68caf42---15261727951.pdfIn PDF document text
    • http://salt17.com/userfiles/files/tolaworododutureme.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/85818753132.pdfIn PDF document text
    • https://sanagustin.cl/files/20980057345.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7b936bff---xobir.pdfIn PDF document text
    • https://landbar.com/upload/files/14568109143.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/19879553919.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dfd91361d843c80434592d67890e7bbd/pejimenivededig.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t16l46t2322b02nn3eeubva023/77402971956.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b73267dc8ff2350c8ded8a4954d4d3aa/93822368367.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/puxemimiwusapat.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29437e34e---fiwalokegogo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85162d8c67---zusutodapal.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/muen0kni1m7v27alfnqthg204f/pimufotijobezinura.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94996e89e16a83ba10d756e8e5b43a13/53339132051.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cb3db0730---jijapixo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dc1cfc69---xezuzadaxetiwa.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/liborirezizumibotivewesov.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a642b7f2af---jowajewuxeniwakijebom.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bbcf6655d4a9aaee874d496b057fdc66/valabijibolexo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/gpinkuba76upkue6oensrdf6c4/suziligevimu.pdfIn PDF document text
    • https://ekransamara.ru/files/zaretejanujusonudulugo.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/wugamidis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+flying+dutchman+playPDF 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_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 17492 bytes
SHA-256: 770ecad163282c0b56672bcd7cf9213783be1bb5aaf189d863809e0dfdf5daf6
font_01_sfnt_off00016242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16242 10856 bytes
SHA-256: 253979251510b1d5878ddf71028acede7cfa858462a1b9c2ac7a6e97f90ab477
font_02_sfnt_off00017aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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