Malicious PDF — malware analysis report

Static analysis result for SHA-256 551a884271a27d9e…

MALICIOUS

PDF

82.7 KB Created: 2021-08-24 03:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0246f6f9f208dbef34cf95263b81cdec SHA-1: 0e67b9688ef82b6c19e21c0410af1f265f249a9b SHA-256: 551a884271a27d9e488d16cf710094f53d51f5b3aa82e1133c13c2745b8f38af
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript and external links indicates an attempt to download and execute further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://drafthe.ru/uplcv?utm_term=the+respondent+is+ielts+listening+answers PDF link annotation
    • https://dietacud.eu/upload/file/53005977434.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845caaf0ee2---pajowujenek.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/87644416243.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f240316b69b25e933ded1c7fb173acb/roluredigedapakenulib.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/posakov.pdfIn PDF document text
    • http://anpo.vn/upload/files/84969839287.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/53420187226.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/lelefe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6edbcafaf---dobexolemolowofeke.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/webesudofesesoses.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/244cf2ad3446fcc315282a0974da90fe/76532675620.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/5603214530.pdfIn PDF document text
    • http://indel.sk/userfiles/file/zipuzuvukigovewurexoma.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sabudalek.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/mavurigedenozoj.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/bisulitobagevetawisivut.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/kenuvi.pdfIn macro / runtime command snippet
    • http://aiswaryamatrimonials.com/fck_uploads/file/texitafugagiwele.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1521052eef86c04f7de249b415afb672/xopatebenasujijale.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/zozuzomakilalunuti.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6996a21b7e77dfeceb5c1156b0bf24ec/44847798690.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/38507558148.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997b9538ddc---dupomovujediponiz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cba658ad---81455547311.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tel6f9qt2gm3oub7dai74e67o1/firamenasep.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/74723774676.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff039152780---60114564093.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/14473163096.pdfIn PDF document text
    • http://tate79.com/cIn macro / runtime command snippet
    • 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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 16784 bytes
SHA-256: 85dbce29882cc44ae17c3da75cbc13d66ea93731427b15ed92c876df6d1ca085
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10720 bytes
SHA-256: cbc1e94c1e4a132c8332d5fe03cd0d170d929dce6e8138b91ce32175e29ee6eb

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