Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c25de0ffdfb4c…

MALICIOUS

PDF

93.5 KB Created: 2021-09-18 10:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 243a34a4651b4b17bd82a274232cf0ac SHA-1: 2831d1c41d5133d81a72b32767ef90e6decb5686 SHA-256: 2b6c25de0ffdfb4cc134d62e59bb87c6e0810c63679d08e05ab778fbdb441e71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=how+to+have+a+video+as+a+lock+screen PDF link annotation
    • https://mtestbd.com/assets/uploads/files/folaki.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nazisixiwiridaj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c26o875ll7ve2tch5pmmu1cao0/46152751508.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/35025416932.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/5748744870.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/10064303397.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuxulimevepajosikabumu.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/bogetazuf.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/75928373093.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/figafakaroxuxopezufovo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kowazugokevizonewaxodup.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8caeedaff33fa6c9eb14fd66b26b3be1/tawerolajagewogevidik.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/941259360.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/20290247682.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/03927a43e67b8d14dc93c51e633b87d9/78552471740.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/96351662855.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/13b84a076a416df001b763b656f40a52/xejukazogudalajigumi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zinivaguxitive.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/gowobaved.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142930ff0703---19141437005.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/93e4217368b6faee2af89c7b0b380771/diwozoxupetisasate.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_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 10704 bytes
SHA-256: 3c5a1947387ab85aeeb005f9ee586eb151fdaee7d06adffbdcde6f85d0192ed2
font_02_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 17512 bytes
SHA-256: fdbacc8a08e21e714daf0a0bb63ac7fa1f7a85b5cb5e761bf82244ea3bde03e5