Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61fb93dd542973f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 17:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb51558d55d4d03dc325237b39af1b5b SHA-1: e45ce4e096db30a3ac16741e39cf4c3e56abab23 SHA-256: f61fb93dd542973f3e116f7176a2a178b47ea0c1d84d1c9244c268df18fa2795
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating an attempt to redirect users to malicious content. The presence of these link farms suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://shamayachts.com/upload/file/96962256385.pdf In PDF document text
    • http://nmways.com/uploads/fckupload/file/38339245866.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/xopijefujesisefunatane.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/44182566505.pdfIn PDF document text
    • https://estoniapools.com/contents/files/loxamulu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nekutusijezavazomo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30993503349.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pudowedel.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/sirowitulenenugukimo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/42196843828.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/donabusugawiwebuduvapa.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/kanefimetiwos.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/51642147322.pdfIn PDF document text
    • https://profesa.net/userFilesfile/folin.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/xijobedagixurapi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bajobitodezinuvus.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/vakezonarakapepevi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/11353949470.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jojasajebotelotax.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161370e75454ba---tutipo.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_071447.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/wamanajeguk.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gajosujipavixoselitikug.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/98776288292.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc9ea2242---2597909064.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nozolasolevifobarejade.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5afe5698a26236d133ccb5521df34bd1/48891086289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=naruto+shippuden+senki+mod+apk+free+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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11020 bytes
SHA-256: 0f6b72aee9626c416d3280f55c6e969d930157fd5625575b594d93ec6d77aae2
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 18136 bytes
SHA-256: 2b48f8f337f051d7628bdfd02f2534a572afe117f37f4f2dbaeff88dc18f5f2a

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