Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e0f448169b5102…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3cb448834b72ccf6e520d2d0fe860a0 SHA-1: e99ad33108980965d57bb600d12aecc10c2e4295 SHA-256: d3e0f448169b51028423cce7aa65d5224af79cd852a941fe4dce32446471d520
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect users to phishing sites. The external links, such as https://smidgel.ru/uplcv?utm_term=kotor+free+apk, further support a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=kotor+free+apk PDF link annotation
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/35375687145.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1ba99c1---bifizenine.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/54635057404.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/16835218009.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ed563e0---zusababekibesuwosekef.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/jivolojajo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/vufokowokaw.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/77887451907.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/sikimumosof.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135178151993---66946828829.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3a1c6796---gomoretup.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/lixokugazejujezudejafow.pdfIn PDF document text
    • https://jin-ji.com/upload/files/99213693033.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/81872272599.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/50074038374.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/totasedusan.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/wosiwot.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/89978833804.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/bilexamuvixi.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/89407533646.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613356b6d811d---21170583174.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/72178336571.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17200838373.pdfIn PDF document text
    • https://aksusu.com/upload/files/mevuniwigowisoxikirejem.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 10024 bytes
SHA-256: c4285fbeabfbfa3b06c17b70868c141563697cd4d4469f3ed9f5c33308270763
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 17936 bytes
SHA-256: 32bd32d921be9df9eb4d3aeaceb11b23dfaa17f3008ccaecff5ce8def4ba1f8a
font_02_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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