Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd48da0580782273…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 19:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab8b69f6c4d9e286b7dee4d7689e2ca7 SHA-1: e6863bc2e8de0a88b1cec23a1354c5eb5a6241d2 SHA-256: dd48da05807822731a77821152537f7c049ccdc52e9630c013e9562eb057bac7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to redirect users to malicious content or for SEO manipulation. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=electric+potential+and+capacitance+notes+pdf PDF link annotation
    • http://cctsw.net/whly/up_files/FCK/file/20210908_032933_113.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/mixelaxosowavuvote.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7bc7f16eda69b457dfcbca6b1a52d43c/xiferudelezufobiso.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/27835435654.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379b9aa1f70---lisujimunurekufegin.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/roniva.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25374e2aa---34359145192.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zaledibemopurenafufol.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/vumavanumuxarajozimav.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/7690519392.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/55425eccd032aa7df519fd0b1f05ef5b/9474818819.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/munusirijebezuf.pdfIn PDF document text
    • http://davcpundri.com/css/file/joxudomomideruseti.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vebopekimutam.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/34254649475.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/30897674334.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/92874707720.pdfIn PDF document text
    • http://keyday.ru/files/files/90419322450.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/milunigeduba.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/gozoravigalumime.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/17673993815.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/72097933320.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/xowigamefewosujawese.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_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 18588 bytes
SHA-256: d5153b87717d0bec879aa199ca6f139be42d7efb1d6bfa89b21cc806b6746a19
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10596 bytes
SHA-256: a0c45685a15a96bf4870a83105d6691ab01c6b60d315f51d15cb741fec77f6ac
font_02_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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