Malicious PDF — malware analysis report

Static analysis result for SHA-256 053c4b47dba795c0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 01:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f967132b8d3b1197182d631bfa81033 SHA-1: a28933ce512d7dd3d19975aa164ac3ff538300ef SHA-256: 053c4b47dba795c0954b544434c4a93c91261871ddc243a6b891024770f7d918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The numerous external URIs point to compromised websites, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://allytemp.ru/uplcv?utm_term=cholecalciferol+davis+drug+pdf PDF link annotation
    • http://recviem.ru/img/upload/jupaminu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/84e27effc6c3e869fa88765dcef5047e/gimubixiwazor.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7aaab738---63933932012.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/fifamagosaxanerud.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee135da58---56525437856.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608096cdf3622---57793241175.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/88970595564.pdfIn PDF document text
    • http://standdominica.org/files/files/98499177317.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608153196e130---95622423757.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/47928355777.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/23045705599.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68671619832.pdfIn PDF document text
    • https://lasanisports.com/files/72690184843.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8df12f042---pezulopemejajakoron.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/18668461185.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0246b337---97375640291.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/pagerixevapemagejidulab.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d75bef0993855f16c7377b2d4911a65a/telajuvejobozimemeruxox.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/batupatiwufamuwuva.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/95351032001.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a29b67528---masabisatetubas.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210831063500_pxz7ms.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uu038oubos661n5k6oorii27v4/rejagukezibudekodizikowuj.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/006c256jalka7ta3qibi0am276/4227419247.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/27551280687.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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 15520 bytes
SHA-256: 260af86230fa64b70fd94c340e0fb7efa41d163bc7130ea506b3953581ac55d7
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 10896 bytes
SHA-256: 64ad356863c20e31e5c2c07757b7075c93df335bc90d14aa339729888278f420
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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