Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44f929668307912…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 02:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2cedcd46d6bdf4b1013f1f1b0ff87a3 SHA-1: d6b129bf5eddcd743358d45a85a92e9a4e7f01a4 SHA-256: a44f929668307912f442b25371d181b9a44398655aef0c4eff60b5cc038e1692
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a deliberate effort to host malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=gas+available+near+me PDF link annotation
    • http://elektron.be/public/userimgs/files/votiromavaji.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p4f1v3cgn4ht48uviunopefpp5/17118871405.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/polowepofelogenid.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3ecb9a3d3f0d5bed721a18e5c05eccff/vokenaraxujununubagit.pdfIn PDF document text
    • http://kant21.com/userData/board/file/40690160175.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lunobobavizirap.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/ridabodikefimafovipeb.pdfIn PDF document text
    • https://egf.tw/test2/images/file/9838511037.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210923_01D681FE18A65CEF.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pegolo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de5eb3d275---wabaro.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ug1cdotgogh33td27cmd2hifp4/38169261846.pdfIn PDF document text
    • http://pnalog.ru/images/file/92123654503.pdfIn PDF document text
    • http://tzsunup.com/upload/xukewatixitufiwinijusa.pdfIn macro / runtime command snippet
    • https://jasmijnbloemengroen.nl/userfiles/file/39596112002.pdfIn macro / runtime command snippet
    • https://gppacdatabase.net/userfiles/file/suzowupijemupi.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/25055944362.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jezuv.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/38237364119.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/duludakasobumos.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/49373548192.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/wikoto.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mozanijikasesinogo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b899ca653f---83871227872.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/18690403459.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/62325373553.pdfIn PDF document text
    • http://pnalog.ru/images/file/92123In 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_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 10296 bytes
SHA-256: 488717553b11b72277ff6199c41e5f11b81c4b20420e193b3fe37d15589e2d33
font_01_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 15108 bytes
SHA-256: d2213a6696e4d0a7de003df3740bd550923de218f1a0454c4c0fd30ea16bd2bb

Open this report in the interactive analyzer, or submit your own file for analysis.