Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2374c99e2a18a5b…

MALICIOUS

PDF

125.3 KB Created: 2021-07-25 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01ae23d2ca70b18b563af5a129150690 SHA-1: 36adb25dff8496a1e5e8cbf96df7e2b403c2aba6 SHA-256: b2374c99e2a18a5b51f1bb79051ff48b8bab11b6af83aca2f6f25254c3ee9aa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://lhsclassof68.com/clients/73441/File/sukapinaroxizifexiwo.pdf In PDF document text
    • https://parfumzone.ro/files/file/digariletinorekewekewijep.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/77392797914.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/52992807249.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/30219096592.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097755d21a3d---zunaxukenokofuwato.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b3d527eb---rebefuvedefiwux.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/dibiwimelewixibinirigel.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/fexobujurenu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a6476e1582cee2742feed89d363e2bb5/garalif.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vobotarudaxesar.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f0d92da09f617563600593a69f4b141b/kunozirewimimovalatigone.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/kelavitig.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f056df942726ad89f88f1eceb63ce643/megarit.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/30496376336.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0811cf6bb1e357d157ec96149a9e48b2/sokazapat.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0088aeac127d8ae200f1e2091b741588/vagikamugowewibixewoji.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af61b23d1b8---guleput.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34fcd3e7---67008051345.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b88b89f8---10082334009.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c2d3a4a8f78516c62bfabe9c505fb6a7/34876370251.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/79262985314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=10+ejemplos+de+enfoque+mixtoPDF link annotation
    • 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_off00018451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18451 18848 bytes
SHA-256: d51b108b26f3497c35338c7d4ab5cb5b901ea530b70721f0fe3b33d4717f1a93
font_01_sfnt_off0001b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AD 10952 bytes
SHA-256: dddf6d3ac5d26bb6ef07dc1110fcd0e919b3cd9b67eb5574fbb8552c343ecc03
font_02_sfnt_off0001ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1