Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8852af29cb9b8b…

MALICIOUS

PDF

84.4 KB Created: 2021-07-13 09:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 31c1ec76873d69b5799a02e5c71782bd SHA-1: 77703e16168e7d5acfb14d602199157616be871d SHA-256: 7f8852af29cb9b8b5d3ca6fec3cc817e5f9d286fd09d11fa5b9a00862a9b315a
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress uploads and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://solamsys.com/userData/board/file/28026771482.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8434cec4a4---2365074458.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c7792c2f---xizufowoxatadulozedemad.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085086bc111b---76640049300.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kefunewobesaloleke.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p7423s6kn4plger1fr08anp0q9/31939294982.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bf663dd9---naruzuvivigapewoxutip.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de47aa1fa2---sadidalilanilepim.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404d9847bd---momimegotepifisofodivuwup.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9571193953---55189294084.pdfIn PDF document text
    • https://besteva.com/upload/files/logazofekogisosafogap.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4c32ab6095be7c0f8b6edb8faf139c26/95374950052.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbfce61296---fozararusirarewilokiwad.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/88788992728.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa018dbca6a---tipoziramotawomiw.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/69395819447.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/4801123017.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/61071337803.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/42fosasnqvm8hfrpr2p8dqvi9i/xinadebav.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/nifefutivakuf.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/16687198114.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd6b11ffb8---99055196865.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bawomonevekibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=funny+horse+namesPDF 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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10328 bytes
SHA-256: 8edb9e0c03c92aebd0553508086bbee761d3f7af16e7a0ea6c64c04b8431c577
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16952 bytes
SHA-256: 476292db4fd1e54e29be50b089ebbb5b97053fecc04801238332e8e7e33092a8

Open this report in the interactive analyzer, or submit your own file for analysis.