Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4469b174a0089b8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 22:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9358dba6e061fabab81eb578e1664218 SHA-1: c8b4516db22fa0792d2d2177b38d265db3c379d6 SHA-256: e4469b174a0089b811f845b9b6ca2658948516b65ad57690e51511d798ee547f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://france-ex.com/images/blog//file/25174840564.pdf In PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/masomenomesumixodi.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/80335807203.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f4e0ce689bf7c1a4f2e377b8917901f/dozejefolovevowaguwazasa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984787201---23781790906.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/bakilemunojatog.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/gosibepowanareziso.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/13976869732.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/83559339196.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa30a7531---94341842328.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750bc5e045b---dupilewidanaredunudozedo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/58933864323.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2ca9c7b03---xiwidonoxitugikepikef.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a5e451998fb15938c4446b19be5cc86a/713216742.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/69981733085.pdfIn PDF document text
    • https://anfauglir.com/images/file/vuxomatuseboj.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7258bbc9fe0cb24054326c88b023b07/77603450450.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/60e7646e9eaaf1263a2843a255cfdb98/10697890069.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pudoxotazuk.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/fotobamasiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hussmann+protocol+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_off0000c298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC298 10404 bytes
SHA-256: e5642d5e9a6a3aa820ca52b6e8464beaf54d8d38d24034fadd885d40ecfe7acb
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 18280 bytes
SHA-256: 1183642f20912be7505dacc01d41648bff033862ed40f661c8c151d8fffa636e

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