Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ac082c01cbbd0c…

MALICIOUS

PDF

97.2 KB Created: 2021-09-18 13:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6baf5c91ef92c867df75c8facffb76b SHA-1: aceb5d037a935668747a0a9509b67dbbbbb2ee53 SHA-256: 11ac082c01cbbd0c621f54e5214bd9ba939709c906011710ff8a0c6f749b1925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that function as a link farm, directing users to various domains. Several heuristics indicate this is a link farm on disposable hosting, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9421

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://synerhu.ru/uplcv?utm_term=omegle+android+online+video PDF link annotation
    • http://www.neoneofitou.com/ckfinder/userfiles/files/71423467340.pdfIn PDF document text
    • http://mousike.it/img_ins/files/6538017590.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/15017310546.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/kitojaketuxegikusivikixas.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/somexolepabuxew.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/poweguz.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/22806667297.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/92268968089.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161307d395e0bc---romulatajetugoxoj.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/74577267895.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/77292533011.pdfIn PDF document text
    • http://www.siposferenc.hu/html/nukagovigudojiruxo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402117c764f---jarereje.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/tutesulesepaba.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jevukeroneturi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/130f7846241bdd1187ff08a33940734c/10909520461.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/4442364054.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/mipaso.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/56564950599.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lusepadopujelo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d488c7e233c2fd8716730795ed0eb1cc/nejeluwogev.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/25502113520.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/18615859323.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/kumode.pdfIn PDF document text
    • https://harmony.im/userfiles/file/74982274932.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rawokujow.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 25776 bytes
SHA-256: da32c8c88c73149681dcafea4c93722419d4695edf4947dee148c6bcfccdcf6f
font_02_sfnt_off00013d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off0001464c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 10416 bytes
SHA-256: c7a39b80101f71e2667e18be22894e3636a4e37f7d6fc61e6960eee27617dc4d
font_04_sfnt_off00015d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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