Malicious PDF — malware analysis report

Static analysis result for SHA-256 8457fd4e4c438c4c…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 08:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74ebff33d51f66eb7ccec19f54ff4d88 SHA-1: adc786863bd64457f85cbac296d7c4a119303435 SHA-256: 8457fd4e4c438c4cbcca930d25f4f0e6c386936c7d7c47dfb5da8b6210bd91cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links to compromised WordPress upload storage, further supporting a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fishtech.org/uploads/userfiles/file/file/sevizadiwoxosusakiz.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b710606c91---pedamenevemufesemawotem.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/xakodenazafudo.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/87759356794.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/14633291823.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdfIn PDF document text
    • https://majubesar.net/contents/files/41196852080.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161421e08eea37---safifakidegubuzabujefe.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/65378340056.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/12454876115.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madimod.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a18b929---12071351159.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/sepituj.pdfIn PDF document text
    • http://hocomesun.com/upload/tatuwirax.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/59751164230.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/demetotorepov.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43678315595.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rukitosota.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/58100572186.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/rabawugudukanejinu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/69945316031.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kikutan.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/92879960726.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56061073511.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/31542766022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=disable+internet+for+some+apps+androidPDF 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_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 17284 bytes
SHA-256: 48a450f48d27a11a56209c4d8e184856c65750b29407111425a8b661fef43bc5
font_01_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 10800 bytes
SHA-256: 459bf5695e968a14a40d145d324b7668afa816d8f7da153410308e25cb848bda
font_02_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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