Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1eb1d8ede20e6be…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 01:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b77c8a74e9a7da2b334e7bfeae69739d SHA-1: 9b3eae20a16c799bd2d1116e704bf73eeee81999 SHA-256: b1eb1d8ede20e6be4a0bd781c50610a8f973925b984fb098387a493d205aae34
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2532

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=zip+code+in+united+states PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mt1tnnu2bluvi2i5glgfel95o1/bobukezakifapemul.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d659410a9aa---94146353774.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/norirapopajeganel.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/suvoto.pdfIn PDF document text
    • http://foodchemsino.com/d/files/37883172494.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fa072db7b2750ef0a330ac550ea1f944/33082797769.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/trabfsm8uaab7uv05sq4m3kg34/34110990947.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/555ea511210d3e2df555cb8f98d3c7f3/negapo.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/99551488330.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/kezovosapaxazogosomorov.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/529182c577db3831b76d296736ac4784/35408096784.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e61a0f09f6af6a952962448ef95ac797/filaxudemixaxuvabokop.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26adfe0264---44376946466.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bb562f4f---83827858712.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/kezebomizeziza.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/bc74b481fe6d93393a900fb90691b694/nupidukumejagutovinuvi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o8ul97vj2h1bapl3r4s2flj2o1/11457588282.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gudasex.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624385480.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2acbd48cf3---dozigonekami.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/58618180858.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caf78e4bd0a---31163544597.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/25807821599.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/30642905718.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fd9dd4ff95fb00231ae4f168d03134dc/mafidubax.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a3774e42d---munag.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/25827620683.pdfIn 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_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16872 bytes
SHA-256: 3da0071f6df168e0d59a6a13c1bab80813342abb88eadfa4e29533a578f025a6
font_01_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 10424 bytes
SHA-256: 7437e3cdbad3f2f3b4f0f8f236ad7577f621109d7b1c204af3ef9dc681b0a093

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