Malicious PDF — malware analysis report

Static analysis result for SHA-256 718a3bb8b07b4ba8…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 16:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9440600148e8a6303aca2c870f257bd5 SHA-1: 7770f01a12aa1a009ad0b011250627fb988fa28b SHA-256: 718a3bb8b07b4ba8ca7eff1a9e3106d86d303b70decf4d8080660a81da693d91
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://garglob.ru/uplcv?utm_term=executive+summary+report+sample+pdf PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608607e088574---87505786798.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/kozikekuxujuponibididod.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/lurogadowomimixum.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/43480324755.pdfIn PDF document text
    • https://resicolor.com/upload/files/nutobotivetabenomu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1fcb40a6f0e1dd28f602e1fe45de7157/wokul.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106201757284015.pdfIn PDF document text
    • https://andrejc.si/files/file/1379335330.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/92856955231.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc04795126---38598552257.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/45724533140.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cb22b64d---sotubir.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/b4fhkms2ne9t8i0ka1t5biagtv/vodubom.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/widujeninizow.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ams0t7lm24n3cdja47ug4ltal5/gekukowolelu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a5aad8571---vudarutaso.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2caafec6---50349601687.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607920767f713---56422301620.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/32953306777.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/of749llkn0llqlvpubkpnii99f/baxovi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884771f3617---giwoxefagika.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/db5330f76b6c962ddbec785c1099ca98/59324206716.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/9745383129.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/33706603124.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/pitatipojunifofijijija.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8feffa998f713e4fbdc6d24a503b0e9a/56499158701.pdfIn PDF document text
    • 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_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 11044 bytes
SHA-256: 7d6e9b927cfcae3732c7061e577dc49e6ea2dbe141ec5e3d6f19e4fbd7dca0b1
font_01_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 17868 bytes
SHA-256: d26d874562f4d36f341768ecc3d6ab12bd94f02a7bec0d862b931a985f3fce0d
font_02_sfnt_off00014874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1