Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8821b29c44b436…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 17:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18923f8722480f8bfb1c7d45210f617f SHA-1: 199bba82d0f8275f3d1aa8e8200cfc972e59f4c9 SHA-256: ea8821b29c44b436f87e17bd34b6420be8947cd1546b2c06eb90d36cc8b99c80
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/n068p0u8hv5vcmr54pn6u8reo1/72448801057.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/58bceb57e2f075b64aa9175e0619ec34/45228974861.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/66199237308.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oi8o0d43flh55e1i925m243sjq/resebexezafunix.pdfIn PDF document text
    • http://tano-cable.com/d/files/tutivujomomexisulupexede.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/dalesokegax.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/47810096201.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/h6pb82r00kflebsaacmbvr0ibb/75111534753.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/noximewininebidibiwewoju.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/93802492837.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a155a28---57494037591.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m59v303kagn0r34uet5n8s24a0/kuwajisilejodutivirot.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pojogabufupokozisaxuku.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc68f2e55---33919704888.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kisazakuwajukus.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/sujiseken.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbfdc1599---9681391360.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/votibulasikilomuzuvuf.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/92456157135.pdfIn PDF document text
    • https://haidangpc.com/contents/files/6243898549.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q9dm37sobpf9g72vp0depu6g2d/4045243189.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd37d757a5---pepevozixorotejixunas.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dugatokebozurusi.pdfIn PDF document text
    • http://wohingltd.com/userfiles/19105865311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diesel+injection+pump+service+manualPDF 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 10832 bytes
SHA-256: c8b45c45bd09e80e581c7944418ee82815520f0eac04ce1f24a680924415ace0
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16992 bytes
SHA-256: 54c6d33d2f98754e0e238db9baf4f6e207534bd410541a6e33dfc639009b1872
font_02_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1