Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38a35ed69ff6e3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-28 11:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a64b642f344baf2fd543d527939f3aeb SHA-1: 2094cd248fc941976f585880734cc695887c8dcf SHA-256: 8f38a35ed69ff6e3ac9c452d828f45b25454fbcbc3272f0ab23c304e221a7b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly suggest this PDF is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://huntic.ru/uplcv?utm_term=season+5+mha+release+date PDF link annotation
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ginedorileku.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/26949222505.pdfIn PDF document text
    • https://mahae.hu/files/files/45644899207.pdfIn PDF document text
    • http://samtekelektrik.com/files/89868187606.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/19671233166.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5bb0dbd0a---48736692350.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f21659768---bozimesokiz.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pisemigarajipubodilo.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/43735200538.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358fbd8ce24---20726186777.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143005c47880---godepaw.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/ragibikebexakomuxamemi.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/wivatamibufam.pdfIn PDF document text
    • https://desarrollostecnologicos.condotiero.com/imagenes/imgeditor/file/38177495629.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/letab.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/wukeguf.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jetikufedufetekorobakefa.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/lewisomawatevewosovogem.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/zizenemuzame.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rifolevunenerawepixawor.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/4993156261.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/80016976385.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/rewipo.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/movezejuruziwonufezalixip.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b1972bfccbec80a437e6c92f2c5c2ae0/kumugalupuwelejoritok.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xuwigelawo.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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 18796 bytes
SHA-256: 6d987512800276a2442ed4a2924912ae13b7647453da135566004f9c17cd40e8
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10628 bytes
SHA-256: 03d7e8dce0d64311e235493e065680235dc66f645e9cde3b308fc9d494240eb5
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1