Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5227234f85d8256…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ae48a47a357081a82d4c0edf6711367 SHA-1: e9dc98f93fb9beeec6d0c572dd6067b36327f4ba SHA-256: e5227234f85d82563782400a4430a951fa970f8504ebd119e19eb2226d6a7da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=brim+mod+apk PDF link annotation
    • http://stark-tools.ru/images/uploaded/lunelirajug.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d852532c2d---26516047455.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060951124609.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/mobulufeduxikeluketumaxo.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/gabexo.pdfIn PDF document text
    • https://binhvi.com/upload/files/5858786067.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/73640431081.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/4302206322.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/rulevijomuteneguro.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hg419jc817gvfscnndgdfpeks/xinozemibavamiwofemodof.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jujuvuja.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejugi.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/fewutamidosugasufusipimut.pdfIn PDF document text
    • http://hzqzg.com/d/files/fetutorusozizawilev.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3b3c2082---sesofuderuketobi.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/wobetuvud.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/71643213451.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/lisire.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/65975337069.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/40099978553.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kamikolag.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c16ea7ad52b054a1ac0cf2cd8b0bf76d/16025447137.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/812485638a7b1f656cbeda9c64171a44/porik.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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 15152 bytes
SHA-256: 60842e883ea78397077cfc4940c1b15eb6a46b27a9fe9fc789e9db41097c7a0e
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10148 bytes
SHA-256: 0612c2d74eb30a997d44224baa599dc85502127f98cb19b63cbf9eded3842156
font_02_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1