Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce543554202e15…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 00:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6835dd8a1f3c27867bcaaa1b8422e29a SHA-1: e79214cf9f7d1fb74886eab2146b6bba06fb2374 SHA-256: 21ce543554202e15e0ba8a92e5f29820c83622d6b0f4758c96f8e463f13c6c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=common+cold+disease PDF link annotation
    • http://www.kymkarajok.net/tiedostot/files/86182601762.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rujebusuxinunalupiwakasip.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/12399556059.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/19044322866.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/wumorazujupa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3536786617---kisorawulufelewizavina.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/aa5e1ad4760cf319105e7dc1eeb45cf5/tepekikarajokafal.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52930580954.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fisukagasuxewas.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3aac3fbbc---funopamamubeseje.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/33617491562.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/javokagaxoxasifagoma.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945f59b35---36923037016.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pefuzumapoga.pdfIn PDF document text
    • http://eyetracking.pl/userfiles/file/43593099065.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kusanojepa.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e040a03c2c---7412697447.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/38242745360c004f790bb6.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/guliriwugovowixe.pdfIn PDF document text
    • http://zzweien.com/d/files/10613872103.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/saxetumupowufebeza.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/99965702241.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6eaedf2f---norere.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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10364 bytes
SHA-256: 7f8c12800f7741f63c62faa578134fa95d07710d751f846743a031f070df0b54
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16560 bytes
SHA-256: 6a5de161af29a1b3a7c5dd4b489c2a27db81bdffdbfc649591ccb3504d6c88bc
font_02_sfnt_off0001334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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