Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2b3110650fe3fc…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 20:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b082a221ce2c45d5db6db444fd972a6 SHA-1: cb0732a3b2e73afa64e98197aa5adb021b9942c1 SHA-256: 5c2b3110650fe3fc028400b73e54a579d22f6598dfc4afad306525015faf0b38
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting. The primary heuristic firings indicate a link farm designed to redirect users to malicious PDF payloads. While no scripts were directly extracted, the PDF structure and extensive URL usage suggest an attempt to deliver a secondary malicious document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • 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://jagamimpi.net/contents//files/nobudumev.pdf In PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/4685867878.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/1114073553.pdfIn PDF document text
    • http://isgsrl.it/images/file/xajatojaputifipezuva.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/betujuzozo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9ddd7fd4---25096705474.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139cdf559e7---ruvinolalefimep.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ov3om3qpkb7jfev2kkpbv4r815/nelugagufaweludotute.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210623003021.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd4d2b040---morexivusasu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97897848566.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/47453462772.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c515f94dede---sazubudefegapikavetepadag.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c686fe3d3d---24774031080.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/961cd2f513afcebc5e4185816ae6afa3/wevanejiserabewemu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1af74e0ec274ad701459ceeecb55fb25/duwinoti.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b6688a196---losajilusisalexurixaju.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/bopafaxupuzamekiguwa.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/97432240975.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/44781627499.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cacef043e---tefisidofi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11308967758.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b3e9ff24---71726499987.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9037b7a0400997eb42b05dbf086d4d60/rojavivagafusunofomubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=redimensionar+paginas+pdfPDF 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_off0000bf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 10740 bytes
SHA-256: c1b63146deb6956dad3ac7fa3e350d772b68f09648ba0eb5d8f6c6aa52670fc5
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16856 bytes
SHA-256: a812e79dee9e66f4e8bee92fa2619d5758eaa1ad4883c9edff37f59a4d279b36

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