Malicious PDF — malware analysis report

Static analysis result for SHA-256 552637033f384fcd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 21:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c4650390e7393b844d8cd62d3ab4b22 SHA-1: 6e86bd070cf353e632331f8e3506b2253a164ac5 SHA-256: 552637033f384fcd829ebb4ffa35d1adf57d0b5976cb432ea79874639a7b5e34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and the nature of the links suggest an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://serenetour.com/image/upload/File/gigow.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/tiwarejinutobegibag.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cemclvtlsct5fa1jr51a8128i4/96195598482.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/48423629995.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161257e0733ea5---bajavobalexigexesix.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/rufijix.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xopodasizozurufolixa.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/kodolonijijipawefixexat.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc6284f48---49065692627.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd41c6a0e9---kavuporuvafomikisonox.pdfIn PDF document text
    • https://sy-tech.eu/file/47269357126.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849043c30a---vogerikevizedoxi.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/22851367825.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/sedobagoruligi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4dbdda98f3219c46bfb7e1dc1b6ff053/17920688524.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20db00a17---32629886091.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878ec8c7445---tomanewoboginak.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/82420100558.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/ravepotatuliwobowipuvaxu.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/tekiv.pdfIn PDF document text
    • https://amblamy.ee/upload/file/86287377814.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627943575_1.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/75431802741.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/65560073950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=necessary+word+formationPDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 17184 bytes
SHA-256: 4f0b2d8792ccac7d1e549f57a9ef389755557a60bb56b19b22b66575dadb20e5
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10768 bytes
SHA-256: 6aa3153338a8abefd3900d38a78f0485843053cebe23bc19882ed22b167666ca
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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