Malicious PDF — malware analysis report

Static analysis result for SHA-256 e007e5ca50d54763…

MALICIOUS

PDF

105.7 KB Created: 2021-09-04 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71f33938cf2a36a6deb326f2890d6813 SHA-1: 319cd973dc38eebdcf93b3bab5691ab95840e1ce SHA-256: e007e5ca50d547630be285edfff79e0647d9bb8832abdde27a480fa047889f8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's part of a link farm designed to host or redirect to malicious content. The embedded URLs and the PDF structure suggest an attempt to trick users into downloading further malicious files or visiting phishing sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=mathematical+programming+pdf+download PDF link annotation
    • http://www.heksan.com.pl/file/mewudubid.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/wunitulezapiforiwuraw.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062318361114.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a96758655---devez.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/vodojemizigadibufoj.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d462927a630---nulexe.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/minolinufuleginedonagom.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/88264226609.pdfIn PDF document text
    • http://ligneus.hu/upload/file/73129955609.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/87174807717.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/42235016858.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/linizewikiresotopo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609573e01e317---kolinivakikosof.pdfIn PDF document text
    • http://museeducuir.org/upload/files/davamir.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5g397oci6nmam1a5c2g83kv1i3/jizanox.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/23297922432.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/vefetujiv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b482768d19---10153436278.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/13192722617.pdfIn PDF document text
    • https://zzwgjx.com/d/files/liniwojofejavizuwanun.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/60902395807.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rdps0ofmprm3epgm2ohaa1eoo0/64682023816.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234653e8b57---16167749376.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763db71c91d---fuletedixilowid.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_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 16984 bytes
SHA-256: bf6a57f3f4edb7f16a49086db22a53aee70a5ec54b59338064e012dbbe3ca44b
font_01_sfnt_off000167c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD8 10976 bytes
SHA-256: c62e8723c12306c51296455cc96444fcf43d4841dcd4c79a08f51f9c7829f213

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