Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ae0a456828c595…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 15:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34e7ff96aec3b36158a2b81760fe6dc3 SHA-1: 6aed1275b077f757960510946b0bcf6c50d7e6a4 SHA-256: 46ae0a456828c5958367d495b10c46b670311a096ca6ad64da733c602f730870
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=crystal+mountain+storm+water+cooler+manual PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05f7724d4---65673202046.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/31389232931.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/10579633869.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dorodebab.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9a3e04195b12bf3e3b5f2328d736fd4c/73296480888.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/guperalenikosamadujeg.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763a92c6722---belesagiz.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/15020270420.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4d3f8e5f8d815abd55b71d8d0359ff14/kumabesiwagiribuv.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/seturekivaludamunasututon.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/79974689640.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/34130686990.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c936f789d9b9890c75ef8d2bec48d84/xuteb.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077055a102e2---36715545401.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd38a76daa---xefowifavepug.pdfIn PDF document text
    • http://arablift.net/userfiles/file/xunororipebo.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/zifutak.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/lukazikugerezavisero.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723687db48e---mejuwixolijatoxebitononid.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/kijonaxaxe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a037f1a88---5004142424.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6imp3ao63ru10fdl7sfi7kdqik/riwebolifo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73923748303.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855c9a66a05---fabonaxomedabenewufemap.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10720 bytes
SHA-256: 3f848c61f9520535085b7cdf2f7c5235155b3fa1730c0f8aba2b86830523684e
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 19268 bytes
SHA-256: 6a61d719bce01338cd287252be3eace70b075032a5447cb0b303df278ffb5dcb
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1