Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec3c40cda57080a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 23:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f3ce3cef9fae0e5d3d0a48f8a2021ee SHA-1: 288bfea1646dfdbc3166ab9f95a059e52e4689c1 SHA-256: 8ec3c40cda57080a2406eb14d46ba3481b762955497765676d8e8dc0c7732602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites, indicating it functions as a link farm or phishing lure. The presence of embedded JavaScript, though not directly analyzed for specific malicious actions, suggests potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wastran.ru/uplcv?utm_term=mcq+on+compiler+design+with+answers+pdf PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d064dfea900b8389fbd462f7f0db0a5a/46954320805.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v4sdlukvhet917lj0rh6f91495/gokevunepufewobidarosu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/aamh3dems3jr3en93oap13j1qp/1810272204.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b454752f80---luwutafikonej.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fqeeskcuceto2l1q27lrtmv04g/davubur.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72a20d336---silirifo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/20534c4992a8d6da2814a0c91a450dc5/lugiwodisupenebiga.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pomowiroraz.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4e5d55b0c15725422696daf60f5d54a4/68697297872.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255d153a35---dudetuseleduzuzivoloxiso.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dslbnl96l8jdvod5pg0d1bm3dq/jokudeto.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/gm2q5muenfua0av1d0kbt8d2od/fawotevubagi.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/fagesasazifeguju.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a54984ff6---sokalorowazidoxogilux.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1317f97f75f17e770664fba80ae5b5e0/tozatenawin.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6cb35jr9gvd2oav5hcbn9v75a4/zoluxozakekivo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7stsgc7eu3vgdej9q0trmiru7l/78353508034.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/muwamoreserobaz.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/42628c0c586a74b1eadd93d99a532e04/31242713584.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eaa29j4v1l1nh5es9vo2l05bbf/tidigogitaseravetiz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/92df22b39d11536b7fb13325619501ac/mekox.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dd5aa3b57ff2f19a65a003e2329be3e7/jemoxolagonujaf.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/878d942390dba3e8ce9ccd1d070aa1de/39420789765.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/pejumuwamajufawebul.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/41092325624.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f6382a2d6b86878d5ea23bfe3637e105/26017349063.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 11292 bytes
SHA-256: f24c3e91c6f82d7099c0bf4cc3a8f0b26957d65f1f02921b5088368fc925cf89
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16596 bytes
SHA-256: 85355059aacbd105d6ed142b72b2d4e08ea02061ec2b4f8d2c6502b4e8e2c17d
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1