Malicious PDF — malware analysis report

Static analysis result for SHA-256 097cb31bc2acdb94…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 19:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 954792e5d3f65ba020d3aa5cf0c85329 SHA-1: af90ef9d0f6788a58ece90c17034efc17dab8f46 SHA-256: 097cb31bc2acdb94659845bfc5d039fecbcb0a0b35ca6f151aa642d1bcf8d9be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics reveal a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7543b541---gowilifu.pdf In PDF document text
    • http://fuerst-architects.com/uploads/file/1374368982.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69894961bb---98502804369.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/tawabegofukujirekumozo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/zixakurulubeg.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c86aee6a35c---20292187957.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf880ca732d---71526575472.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xipunarunomawenatava.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31743792726.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/matapavazuvutemu.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/77150137187.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/notewedu.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/jidesitizoxila.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2d8702b53---difixosidi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/lbpagr5kpfdv8al8310m80vpo4/24026082611.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/pasunulodebep.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/53036799647.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c990169db---5326802443.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e689dad5---79626238866.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/sonubuzefumetin.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce797126841---1725175897.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/dogenon.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3de83125---fusosubajigovapenawefe.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/77129073042.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092648d2edf0---9046282828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=composant+electronique+cms+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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 11056 bytes
SHA-256: ddbb549de82763e6380eb41b6f71e7b91b89048df9c93db243c3948d437c4756
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 19696 bytes
SHA-256: d0c07208ab505716fc80ef50bd02e8a2827800855d56e636e0b90eb523a70b1b
font_02_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1