Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7e21faa9bb31ed…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 22:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64eba508a842202de6e319336ff57b39 SHA-1: ed1d4175ec62f348bbe1bb77e9f3e9d878f24c4a SHA-256: 9b7e21faa9bb31ed5384c03165d08345bf2d94d24d3f41105e470d0c2ff530b6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on potentially disposable domains, indicating a link farm. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent. ClamAV detection confirms this, identifying it as Pdf.Phishing.Trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://aramlasmerok.hu/uploads/file/95569570169.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc0055dc2---mirefiwulokepekezaxajon.pdfIn PDF document text
    • http://esistore.com/userfiles/file/92342927081.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210915183530.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/27183447173.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ditufutipanesadepisupula.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/78311397598.pdfIn PDF document text
    • https://fasleh.net/Files/files/21645786578.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rkgp204vld0cghc1qkp64b38fk/mowesenudimufutivix.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/33694949097.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/96785243319.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/fezexozezela.pdfIn PDF document text
    • https://thehouseproduction.net/file/pitosexufutezexupuder.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tumadulitonip.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/39826192513.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ijdg8m1d6hhje2k05dlakjqba4/zabojelidi.pdfIn PDF document text
    • http://gro-felix.si/uploads/46993280548.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7b632149---1850511132.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/33933351691.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zupenejuka.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/27650108144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=video+live+wallpaper+free+downloadPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 17460 bytes
SHA-256: d7be7a3697d80d7a20d1038abce04f6df32125a5e835dd10cf5cf8abf0a9c556
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 10344 bytes
SHA-256: 87da9da6876623c0ff0e30fe5f733ffd5d330d4cd4f5cc2f15f99fe85b27312f
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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