Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea00e3680102179…

MALICIOUS

PDF

90.8 KB Created: 2021-08-14 12:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42b8498ba34753aacd0f11a66e2aeba2 SHA-1: b5b35a730e82464e3f76b3e260bc47161e0ef29a SHA-256: 9ea00e3680102179f8165943e1c0e71148118d43695b7d91fa30644fb0616bc7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URIs, many of which point to compromised CMS upload storage. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites. No scripts were extracted, but the presence of multiple links to potentially compromised sites is a significant indicator of malicious intent.

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ff3e278c---niramanuliwas.pdf In PDF document text
    • http://varanini.pl/userfiles/file/36470799201.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jozunonobiwekegutepopap.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2hccaqulef29ruojf7lcnv58l0/71973547302.pdfIn PDF document text
    • http://jsdarvin.com/files/31728267993.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ed930b0542c58bb23a95d537cd3d4dde/47354137073.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ktoj7fnbmn9jac7pp1g5fe745e/pizaduzituxunekose.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/55264373056.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601141141590342.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95374497ed---16764662847.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c661d4f85eb585e167e98d020a91641/9592081165.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/wukapexa.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811da500d12---10935588992.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ba230b0e3f560217ac1e26f9a01e78f3/gisapijo.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/55895477088.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/mazebonotifowegumujotakof.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/badivit.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf2b07980---tonukivo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb14972b1---79359198361.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c0524fa070e5501031bb13cab560045f/majijuzepibis.pdfIn PDF document text
    • http://garderoba.sk/images/_file/texelijonav.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/66094510866.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/33455346318.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nubasujuxilipekagasi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/pokofinofik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+pair+plantronics+backbeat+fit+3100PDF 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_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 17692 bytes
SHA-256: d69ad0d7f3cb7ab917a35ff7e3b2f57ee8ddb316bfddfe73dbc06c42367768a3
font_01_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 11128 bytes
SHA-256: f56c40057978eb184a360015ca8a76ee1109b8d9d8242165aefe9d02f0c7b408

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