Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfcc7e10b5050c9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 09:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efec96bde6fbaa2282ae6b271c6d8821 SHA-1: 49a42c20c2528c22df11d13af0402bc19a9fc596 SHA-256: adfcc7e10b5050c9c57d790a5106cc2b5260715fcbe379703fcc1e9e31eeb19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. This suggests the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pelejas.com/IMAGENS/CKFINDER/files/duvurebijuvusuxudajoluzuv.pdf In PDF document text
    • https://rivieresoceanie.com/userfiles/file/95756979022.pdfIn PDF document text
    • http://kgmda.com/upload/files/89038015093.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/jajafo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/70617234485.pdfIn PDF document text
    • http://medica-brno.com/files/jovitem.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a83f54d286.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210908_062902.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0459c375415d402445fe3d00d0bb531/lutexupapotoxitewojezosig.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/vurenekigubamovezufesux.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/vozawemobejajipixedusex.pdfIn PDF document text
    • https://digireg.at/upload/80949430849.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/javojexo.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wojidurexilazebowad.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662dd9628d---72790557151.pdfIn PDF document text
    • http://candientushinko.com/images/file/37193074417.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/66925133382.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/62588136586.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/difatibabiwarad.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://bulmarconsult.com/files/senudexiwetabedotelo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f563073201---moginusofelofar.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/rewikaxuxod.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/bolasunifobopofugipez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=at+bertram%27s+hotel+pdfPDF 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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10720 bytes
SHA-256: 5c93f0e60f53275705086ae309fa6a0da5b0b3bd003043ad1cc718f1c204257a
font_02_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 17704 bytes
SHA-256: 3659b2db4fb99c3206c0e2d98d8ea35376526571b361007610c706e3e9a67233

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