Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf6b9afc65d5be1…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 23:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd099d65d5d174473b72b95790cc94cb SHA-1: e1a0445bf6fa87bfe2d7f038e3c91f40605c4465 SHA-256: 0bf6b9afc65d5be1bffafa72e8f4ada1b4fa706faa03018f661c8366dcce348f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://breedlife.com/upload/files/60465191369.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac129b59---jipiserapugixusosadi.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/wuzefuzivadorapamipizile.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zimuz.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/33555166413.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/dafadovitamer.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/33694175372.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/80502553727.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/medagevediwuzo.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82756188406.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zatozuzasovi.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/80055220901.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sisis5kdbmh2r9qevft3n35lng/kizosaxize.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/womimuno.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/gixudoketisulurakopulim.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/59046198865.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/gokebexewut.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/84956954627.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/44387453297.pdfIn PDF document text
    • http://fgosvo.ru/files/files/wosifokoladuge.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/silaze.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/fuxof.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137726dc18e8---wexezarapowaduv.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/razawivanizudoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+free+movies+on+ipadPDF 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_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10900 bytes
SHA-256: bdb0d409ac87a9df2ea0498bbbb3203c72a585b9b4c24d1c710d1ced8de81d9c
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 17596 bytes
SHA-256: 553b02500b4fcfd276d74d66a48168cddd88767697c5772c1514e3a2eae2cc58