Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7374a1211a97544…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 21:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6374cdfd915a1badfdd72b3342a097fa SHA-1: fe40b3033e3d266a4e0d8cf67fb557885518c221 SHA-256: a7374a1211a97544991600d2a33547dc6888faffffe2b5039a80a8dc029e7bc0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dirugiro.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/budotosowuzupizowem.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/moxiwazot.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pukirixiguramulafugepalur.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/59618521334.pdfIn PDF document text
    • https://purefeeling8.com/data/file/73945002639.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/dulerirubenizelupo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fd29c5b81b9b96b259c20a431a09a68a/86996224977.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9tpb1ne3v3p7ep5tt4h8po5f3o/16269749799.pdfIn PDF document text
    • http://yongqingtech.com/d/files/veparinutazaxujopip.pdfIn PDF document text
    • https://dm288.rs/slicice/file/17973470164.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109080357398600.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1a859b34---jadevutolip.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/govabegilapuzal.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/93854368386.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/48257415188.pdfIn PDF document text
    • http://sinostandards.net/upload/files/79348367488.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/28906450348.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/11122752332.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xomigesexovasuwatuf.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44176954031.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4d8e0082fe0e5e629ea83b0cfe3e8043/75083390988.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/80319036225.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/folozajafiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=copy+text+messages+from+android+to+computerPDF 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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 17820 bytes
SHA-256: d3734b4cc7c1902b21713e2cf370204fc5cd6311efb981dcfd464ee2e3ef737a
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 11264 bytes
SHA-256: 4a7a12336b4874d19ffb05cbc6ce0d09f5759af40e0ab7256ec23ca044811dd2

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