Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a95e21a866233d…

MALICIOUS

PDF

88.2 KB Created: 2021-08-30 10:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 617e42f74de598ba5d40bb324f572354 SHA-1: 9a715c531fd49fbefe3e24b4cafe9d57d019a1d1 SHA-256: 82a95e21a866233d98c0478eb840ba24bbfd0aea4a74ec09d8d86a71e95bf728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b63e5985256f3c1a08811588f43763c6/10845667877.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22553e1158---zawedivibes.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7bb452e5b---62366093586.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23070a6bc---9178635716.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965c62f35---jebuvubopu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208dd3c2438feb61fc23724cdaf7cbdb/27406931475.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/subozejuxegetuki.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/85246351320.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e719e99813c---65797881704.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/novafowewuwige.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5aa58bbc3---nakawadalesupema.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/20888734922.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6lfndtnp5lqaa88cnk1locupn7/76915072651.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t32t882c709mvmg71psc6rt419/kawopazes.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/71dd70d842d7865b1ce658bcad364476/91201101643.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/f42d939c9f312055bcd6705318525a00/8400239615.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/82245000474.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358620bf3a---kivabeg.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/pabupinivojume.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8c35417e---guzovomig.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/juduwofulojururaratel.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bab37ee6d---91824705360.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/88259706523.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62134062---minagimerimerewalivove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2+dimensional+array+in+numpyPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10692 bytes
SHA-256: 0c3ffd46c8b16316ea7547f6f5ed65d03dbc4e5a8054b0519f3168948a33bc4d
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 18988 bytes
SHA-256: 8ed070fd9e9fb52550bee3b6b505ce5ef92fb0fbfb576e3cd665b182f67a3c5f
font_02_sfnt_off00013a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1