Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fff74a5b954ebf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 01:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dd275ab828f3e702eb2bacd036f35b7 SHA-1: 67b0fb93f36318a374624998b6019f3bf1b62ab5 SHA-256: a0fff74a5b954ebf3aea525ab7c985fe3da02cd4a1842b91bdfa2e9cf9bff7bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://celcg.pl/uploaded/file/gixesumi.pdf In PDF document text
    • http://architetturaurbanistica.it/userfiles/files/somapamex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384827e9272---24457543118.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/fosojudezemaledoguna.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/kibubixisozoxiva.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/2425903396.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/teramefafa.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/xikerejed.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/jatipanutazo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/75935444708.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f713201404ce4660ea8e6be4fa5a21d3/5394359634.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/pobuwedusivubopiwazubok.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/81874095429.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/nonakepelufakovudonutokad.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vojotawuxazifebafaj.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210918062921.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fuzixudodosodik.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d140a8cd---golobumuredefoporawusowa.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/93458217783.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/99326934634.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/3163356837.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/25363091585.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/fukerisomasemuxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=latest+version+of+pubg+apkPDF 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_off0000b721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB721 16280 bytes
SHA-256: f140682e44cddcb8d655ab2373809036f6f1136c695d978ea88dc4b77df886e3
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10844 bytes
SHA-256: 3d949cf96ba8108252cb10c790e5debbc642be2e9ac5b02941ea265dc7d087f6
font_02_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1