Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fadd33a1b1811e…

MALICIOUS

PDF

104.7 KB Created: 2021-06-21 01:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a0616057652389fb1300fd50c359a1e4 SHA-1: 725ae74edc41c9a10c3deef4127c89277d6f8e9d SHA-256: f1fadd33a1b1811e3e41655b3ea44eceaa55bce4ff13c9a05390f3e8cea4b0c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports its role as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/uplcv?utm_term=medemer+english+version PDF link annotation
    • http://msslink.ru/userfiles/files/poxadigek.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dowubixofemumubixasapoj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a77ab090c67980cd4bcfa413c2a2674/mawoxokidemi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0d84033e---tufaromorelalasebujobera.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ospba5ot7dnught5e1v54qrt7r/vazoraz.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vumizivofudajaboku.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zinibifodigaxiti.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/crudpu4qjij1mki4mbgka6lq65/4882851778.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a913483e51e---wunubelifipogedafubenudib.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160727061231b7---zakubixitalumaxugozojap.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/23254467706.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/64ec0e3cde07b001d42323af896aeaf5/57701374915.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb1ea02f7---xosekimatajizuwitewariv.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/45a98052abfb256f1af0139b64907747/fodarosi.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bulopanine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 32940 bytes
SHA-256: 2619f2a65cb639fe5a536a369670df76b865161f22c1fc55b294f9973f00ee3c
font_01_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 5096 bytes
SHA-256: fc51d5a81914e035896e19687aea6b43597682b8a86223982961d38a0d6bc02d
font_02_sfnt_off000155f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F6 11736 bytes
SHA-256: 66925cae6c51dd43c1270b3055aadffaddf17dd49527d7473d37117b35d1aacd
font_03_sfnt_off00017d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D79 16460 bytes
SHA-256: 066bee5985cf97627ae58cabbddf9ee9e32b20ed2ba34c0307524280b6b3a52a

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