Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f21cf8c83102df…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 19:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7447b4d363ecaeff9fbff26b7ba4d2c5 SHA-1: 873504782d588b6373ba31c4b831e8bf7e1955ab SHA-256: 01f21cf8c83102df729d5322d1af9c43a104d9087fc43598293debacea2ce7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=mod+idbs+truck+simulator PDF link annotation
    • http://orenprom.com/img/account/file/8140675619.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/zozunezixamapiger.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50540662179.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/92116001971.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/suvipekowirukamijuvesesa.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/natatom.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d585781494053d0c00b355e2ddd4a03a/kezijor.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/87031583821.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b798fd7631---11424426475.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/44582799709.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/18761028317.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8c06e6293---nalevinu.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/murenomamivutes.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccecd2f257---72324088560.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109111205576665.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/65572796024.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb585bbdb---81840529665.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147541500fe0---besobumuxapusidolaseg.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/rusex.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ca1a202e480124f4ce98f85bc0a406a/wilopukal.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/3924336695.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/89692483850.pdfIn PDF document text
    • http://goldmustang.com/files/files/62573908928.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wuwizet.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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 10620 bytes
SHA-256: f9c2f6b7da6c0eb752e2a8212b4bddd48693bed3bb34a33f6333d03f24363a65
font_02_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 19316 bytes
SHA-256: 6f73a061199df75fb2f3edea7699017ae07067e219f626a098b3641b59d10bbb

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