Malicious PDF — malware analysis report

Static analysis result for SHA-256 0940d71aa7c7b07a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ded145211e6dbbdf140ddc31a6e17942 SHA-1: 85230a6f3d21f3153f9dc5a8542a36efd08e20f8 SHA-256: 0940d71aa7c7b07a5f9d0abe18a35d2e9d99972b6e51b2c1c76a0265473e159c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://prakseologia.eu/userfiles/file/lanozogu.pdf In PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/josefinenazeworij.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/49492479873.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/winaxesuru.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/236da24668cb09ad065ddd7596e81884/fowajozujur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141691f72c4a---37644734533.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/50011204222.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/tevepamasoragadadaminelo.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/5570975036.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fapeweduwuseveka.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1009f7bc---malaramel.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/sudaxojon.pdfIn PDF document text
    • https://beautydent.hu/editor_up/sodoko.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/dosezilisameve.pdfIn PDF document text
    • https://samowar.ch/upload/file/wataf.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/63881762993.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/17736572657.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kijomevip.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/70552b5d7ea9e9b67801f8f1f73e00bc/napogedigowawaxelogabu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/rilenini.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/jasadejubopuladepuji.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/noropibijab.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lofezaxedopudisega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+bollywood+movies+online+hd+freePDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 18492 bytes
SHA-256: b970c58f5b1d1afcdeef77c684bdc8153270d9373e8092361cd798cfb1317055
font_02_sfnt_off00012337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 11140 bytes
SHA-256: accaf9de1efcbb8e491adc2fce669f6e9afb418f46dbdeee3354066e4d0876d8