Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f2d9d57424a84…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 12:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58085cb5be6ab060e5dcb81427acd94e SHA-1: 8233c1b5b4863ebf6188f68678a39e4e1d68b3f4 SHA-256: 8c5f2d9d57424a842a8de569ed9af43df1c9362f765ff4254bf68b08f95b738a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=how+to+reset+time+on+android+phone PDF link annotation
    • https://jahanchart.ir/data/files/file/tolov.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ad93e3efe10ba4cdd779112ac0036132/fikazisolofetuku.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/zorexagajuwusupu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/95971627731.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vifizipob.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mizazagalax.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/30415565568.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/21093416609.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a427931b29---42299005619.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/40414527858.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/jimazozex.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/3808419165.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210904164312164.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5ei08ia6lttqime1i1ror9akbl/5456643083.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/57070411264.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kejasi.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/30464135594.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/tiwizawogapu.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/mupinudarupunud.pdfIn PDF document text
    • https://tigapilar.com/upload/files/ruvokimukozasemudu.pdfIn PDF document text
    • https://tpk-m.ru/files/file/38857024281.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/5736610582.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/samesetomefoguji.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/goxuxepevikopasegoxujiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/luwuvavefuzoserifemozuj.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/2029968289.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10688 bytes
SHA-256: 9e2545b7ddcc19432a71cb905c81195b2c93e860c162fc17a12526f0ecd33053
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 17620 bytes
SHA-256: bd871aa90e3b6a689fa5389fb2cc009935b20a5d528c4b21bee8c8a279539ee5