Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f528a95d4ed1e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4f7b7083520c57ddcf054a178bcc91b SHA-1: 0a7c4c533e88da12020ff516ad189d0ecaec5d70 SHA-256: a57f528a95d4ed1ed09d6e6cfd9d28d91dd6fd607479bae7d24d395907d1b24b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS platforms, and includes a visual download button lure. The primary goal appears to be tricking users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/pomodumeb.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a25930af093---lawaretakekiwole.pdfIn PDF document text
    • https://digireg.sk/upload/56169700574.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/89929211580.pdfIn PDF document text
    • http://espwireless.net/uploads/file/46427950835.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/83558988306.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146918ed751---42817042427.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b122987db1---wubusivugolenigafaxoru.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaef3a2e00---jurijesuxabez.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/gikatepira.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/6851854879.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06be07c6---rovoxaziwujafitejof.pdfIn PDF document text
    • https://energooptima.hu/upload/File/renagorazibegevedavol.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bbd3d9c95---sukajokirenusazifepewi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87019439322.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zuwexiwavemasobife.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f0b1e7f6---zapinosibamafugam.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/3109651197.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/59154893686.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083590bba7a0---49573776167.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/beruxoteridiju.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/jifofu.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/84140342362.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/bksdqubqsg6g8n29cvp1183to7/97224133311.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/jesaredegizewedonowisav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+fire+red+rom+zip+downloadPDF link annotation
    • 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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10632 bytes
SHA-256: a9e3181520428725ca7683ecdbbdf67285bfc7c832d0e8bb6625ca9136586bbc
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 18964 bytes
SHA-256: 1cd1459a314751aba8660a212e5855b9b0f3493292954ed0efb285cffa0359b9

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