Malicious PDF — malware analysis report

Static analysis result for SHA-256 10597d5e94918885…

MALICIOUS

PDF

92.8 KB Created: 2021-09-06 17:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 141311e6e6a3a054c8353f9ac2c15d4f SHA-1: 0d241dab72a9613000bb7c948699d0d5db3b1bdf SHA-256: 10597d5e94918885eace41f7744b35cce407282bd9a3609a13f4f6e182c21e8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, disguised with a lure related to 'english 10 teacher's guide'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary goal is to redirect users to malicious content or downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=english+10+teacher%27s+guide+unit+1+pdf PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d950297e5---11777660881.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/xixumojitelozedinu.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/sugagiduzijosumiwenu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca32deb2f---zapakivus.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/poxesidaragi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b82e06691---83188279686.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/9968442006.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mogas.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/42223261094.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/wijozunefaliz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dbae00fec9cd9a9f0fc758a72d54e351/87542385755.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ou22kuvgi6cv8r8dv1forh7l7s/najopi.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/pixuwolewowiwumatare.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a249b6902---32974762173.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kaxafujixelejopefivavonis.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/aso89fb4nsqjci9of51ct3i5j3/96081487108.pdfIn PDF document text
    • https://zzwgjx.com/d/files/87978700404.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed03bd478---17579207304.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/xakadufikuzoradoneda.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/73790126555.pdfIn PDF document text
    • http://ilpeace.org/assets/ckfinder/core/connector/php/uploads/files/xesijapovuvigadaraxixab.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a463ce8f566---13035006648.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/8397206308.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fea1b8b---68726868419.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/letunomet.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_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 20132 bytes
SHA-256: 0d378a9c7a0e2004012b70a6b4e88140e2a5915c56399f830bab9dc04da22f9e
font_01_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B89 11068 bytes
SHA-256: 8d48aeea9c054fce09b7975b8cdd30ae283fd681117c6bdfef6be048c39759dd

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