Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b7aa5cd15fef8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 03:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c2ba50917632ae53fbaf405b3b9aa75 SHA-1: 0ea580ec3df3795d867d553b9bf528f3a482dc4b SHA-256: 379b7aa5cd15fef88e5f203eed983408f70d25bc946377d39ff270ed1313d6ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+to+download+tap+tap+apk PDF link annotation
    • http://easyliveconstruction.com/ci/userfiles/files/kapem.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/92282032200.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55349516326.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/rojaboka.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/tukawuturasopamaxon.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8c47e02e---67749643222.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7dj359g2s9gavg35h2s57ct3mg/zidevola.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/wizinimolijobekoridifumub.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/ginifaxitusur.pdfIn PDF document text
    • https://blokhol.com/upload/files/72720564481.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jizub.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/femibuzesaxajisuru.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/vujevudeselinupa.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/2583672209.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/xegawogekiganafifusagixer.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/20264747714.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70ef6ab74---daxetunejer.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/63717529558.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/22f050e2c614ebeb8bf7bc23fa2ee1e3/tusegezisumenidiw.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/15764616231.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ae42186e---wisegegokivagaxav.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/josuvazikupes.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/90916852023.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10064 bytes
SHA-256: 526d4b41e9849ceae9d6f380b64d3ff039d11587fec15294068fca81ed96a4e1
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 18452 bytes
SHA-256: 04b9186b6471b8e5e55c124c050a762bc59156074acdbab748070d5f34f63756

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