Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d831f10344329…

MALICIOUS

PDF

90.5 KB Created: 2021-07-27 03:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d79a3b9bd735ab36c4bc9141e897987f SHA-1: 64a8143e2a2a6978a8d376fa0b090da463303291 SHA-256: 810d831f1034432982fde46dd50f3b76efca295821b0202e1c04909d2896ba55
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS upload storage and disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://webmenuplus.com/images/file/80241796570.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a60eaa9c8cb---54944161012.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217181136255751.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/pupiforiboruzi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nujefuwojoraxujumidaru.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/doganivapidakolopijem.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12605486888.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hsmvkh76dcelvvc76mc05sefvm/wutotojixul.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46881780990.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daf28058a91---78796223648.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zubiwolozibodop.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/da0lg1oqrcqcdjcqo7iluom0e3/60808180080.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b6675196---kitivax.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/69499158160.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0p1pkfthtno5ns623cbjsgvbnj/fenotazemug.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/divowanawasoxejexifovewez.pdfIn PDF document text
    • http://geodez.com/pliki/file/xefudiw.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/debajoba.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/92309312015.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fcaacc57ef772b9d5d7ff300eba2cbc5/gozarajufilodozabud.pdfIn PDF document text
    • https://advik.net/userfiles/file/74918353458.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/44589550226.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d19fe32---depazefagupej.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/butenef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+trim+an+english+cocker+spanielPDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10988 bytes
SHA-256: 4fd63a8a7fe7e1355f90c9561df9416dbaec680c8ad8fa5a6f1cdc0c5efe944a
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 17608 bytes
SHA-256: 178ff903642d01ed1488bf90eaa1526f8df0d4a3af430d5f03518e747f1e23d2
font_02_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1