Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eb1a711bbb022e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 15:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fa89321172bcfe6559386dfda46b4a7 SHA-1: e3a8866fb4720da9f638040ea43bb34fe42b3a87 SHA-256: e1eb1a711bbb022e37db952005588d8671215b41196def65ff7e30bf905e2c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=adult+play+store PDF link annotation
    • http://microcement.ua/userfiles/file/pimivegiruboramo.pdfIn PDF document text
    • http://floramarble.com/uploads/wifibapakidofub.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/24979911403.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xikafusaxewulabapik.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/20902985707.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/65081891000.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/judonutipuxe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322e20e438f---2066745411.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/71203609767.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tibuzojiniligizisabux.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/fubibiv.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/lbvma4jmrk7v4dfgp3b8f7dcmf/fuwunul.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jolebizoxupupurapaguxomuf.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qsthjeba73fnd6ievrdvtn6s4n/refabojejopobepisodu.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kutixufomulakajem.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/26590053219.pdfIn PDF document text
    • http://safarang.com/basefile/files/20939082295.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/ropexopiduxuwi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/72058293880.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ruvozalixevigapa.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/15772469750.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/24434022062.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/jusikutokopulupuzi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wamopenulewogiwebufepugad.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/5596241925.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/61840951422.pdfIn 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://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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 18588 bytes
SHA-256: 3d8e7db7972ae43dc8dfee76e69453b71c6e18dbecc9e3506e01fdf76878b344
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 10384 bytes
SHA-256: af3427b1240641499b52cf21ba6ae7786a05c863c3977b1e2d85f9cef7c78d7c
font_02_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1