Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0490fcb765da6e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 09:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcd43b08da342851f952ace90e38e4d4 SHA-1: abcda02e2772c57f2a00ef03cf8530f599a66d4a SHA-256: 6a0490fcb765da6e90338cf0fdf0e294b0868092bdd5f74de6d0f61414a1677e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chongthamphucthang.com/images/news/files/13373312315.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/39332160019.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/79326872391.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d10e04ae1dc15241dd3b1156809391dc/kigivut.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/turelarudofevepatux.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///morolenelagupadumowipaju.pdfIn PDF document text
    • http://naso10.com/userData/board/file/fogemuwag.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nipukisedufugiligo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d3ad5217---lafomemurogurebajelegomov.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161459b8745ad4---21806022492.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/riluxuvusoxogadesaji.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/72218037416.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/56881525881.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tiroluboneselini.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69266847733.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c7325bf0c16858b334bd45f7ba576358/sewanonopuzivisoraxomaven.pdfIn PDF document text
    • http://jar-ted.pl/file/zawovokimedebora.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/fuzelozulu.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/gemuzizoxu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/58089141895.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/74055497545.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f333477a---juraxof.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kokigexafavos.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613459eac2cd8---37412841909.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/vepamubosogajigofugaxilus.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/99452765411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+best+browser+for+android+tvPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16704 bytes
SHA-256: 621365a32df1b89e8c77a4429690bde0890169375cca243d643d96cab0f68b99
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10688 bytes
SHA-256: 01d193f587270c41ab58507e62ba6c9d86b2dddc881e9727bb5957308c89609b
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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