Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f4effd8a2c53c5…

MALICIOUS

PDF

72.2 KB Created: 2021-06-11 16:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a607e1c446c02957d7a14f88f205038c SHA-1: 194c518622b5f820407e998a2c5b579a0a58cdb8 SHA-256: c7f4effd8a2c53c587dd5d5ae134a5ce223a46ec88b5a6446fdd55f76fd47e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The presence of a seemingly unrelated title suggests a lure to disguise the malicious intent of directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=how+to+beat+the+ender+dragon+with+beds PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160733ab9dcb0d---92617840053.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/19497pinb5f0fsnrpb266m4qev/bubuzewajubijikolisozeveg.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/separofopiwo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/56885189135.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5994ad121---jatumekagegud.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/5562480409.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/bibivowuxaxigasas.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pibopisetoviripedanulit.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8af569b98---75620589353.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/mafajubaxolalugasibuxo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ffdad795ae364bf5384e6dde57cb9d98/23362445839.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607950e1f0017---benovikut.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2caf7cb39---sojikenefibupiwi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14c10a3d3f---fapawojuvomapotatujeguxuj.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/121dedaf248ecd178af4f533a76b4612/duguzoneduvedugamuweje.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/nuwomop.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 5248 bytes
SHA-256: 438c351d13d12b384711e55fded48137d01f7598a5f5e4deea713cde224641d2
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10916 bytes
SHA-256: 5481925232b2c2fdd16080f54caac63af75f6fd73864f6a00593cf0b7cf8f1d0