Malicious PDF — malware analysis report

Static analysis result for SHA-256 2820e098727dc113…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e16b355a09fe65b71938b7e5dc8786bc SHA-1: dd49b7b0cbd1dd1505d4ecdc6e1b3540d36691c6 SHA-256: 2820e098727dc113697018d0562239a68a0e94f26182381881aaa4465082bfa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=friday+night+funkin+game+unblocked PDF link annotation
    • https://newtop-eg.com/userfiles/file/80372237623.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109120614568489.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/23342419513.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/17447083326.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210915/file/16317106991343.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaa50c261---sumerorizitur.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/99930959660.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136481d21b02---fatusewugagu.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/dawakadevodenepo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8889ad00---pafesifarujogep.pdfIn PDF document text
    • http://fedime.org/imagenes/jepanakijisuli.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e293724d3---mojodapatezu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210912071026109.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34400090219.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/60759514759.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zitelawaz.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/soxefuwudibaw.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/75814951492.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gasuxojezodutabilokiw.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f2a3f7d0163a9b75d7eb26a91472ad75/kijubinujazunuwotikifitu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/saxusa.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_off0000bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3C 17140 bytes
SHA-256: fa792769de53c5803400315bb80edfb19b91d70beb837d2e3e7067f444877db0
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 11176 bytes
SHA-256: aa36f5a7028c7c18ecc97f92ae6dac01756853b25bf6237fc9d80f97d2183ece
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1